OPINION
Before TUTTLE HUFSTEDLER and KILKENNY, Circuit Judges.
HUFSTEDLER, Circuit Judge:
Plaintiffs, who are inmates of San Quentin state prison, filed a civil rights class action challenging the constitutionality of the prison’s disciplinary procedures. The district court held that the procedures violated the due process and equal protection clauses of the Fourteenth Amendment and granted the plaintiffs declaratory, injunctive, and other relief. The prison authorities have appealed.
The issues on appeal, phrased broadly, are these: (1) Did the district court lack jurisdiction either because 28 U.S.C. § 2281 compelled convening a three-judge court to consider the constitutional issues or because Preiser v. Rodriguez (1973), 411 U.S. 475, 93 S.Ct. 1827, 36 L.Ed.2d 439, required the plaintiffs to exnaust state remedies before resort to the district court? (2) Do the protections of the due process clause extend to prisoners who were subjected to the challenged disciplinary procedures ? (3) What process is due these prisoners in the context of San Quentin’s disciplinary system?
I.
We agree with the district court that a three-judge panel did not have to be convened to hear the cause. Section 2281 does not apply to a suit to enjoin enforcement of regulations that have local, rather than “statewide application.” (Board of Regents v. New Left Education Project (1972), 404 U.S. 541, 92 S.Ct. 652, 30 L.Ed.2d 697; Moody v. Flowers (1967), 387 U.S. 97, 87 S.Ct. 1544, 18 L.Ed.2d 643; Hatfield v. Bailleaux (9th Cir. 1961), 290 F.2d 632.) The plaintiffs’ attack is limited to procedures conducted within the walls of San Quentin, and San Quentin’s rules do not apply statewide. (Compare Hatfield v. Bailleaux, supra (three-judge court not required when regulation challenged applied only to single Oregon prison), with Gilmore v. Lynch (9th Cir. 1968), 400 F.2d 228 (three-judge court required where regulation challenged established rules for every prison in California). See also Sands v. Wainwright (5th Cir. 1973), 491 F.2d 417.)
A more difficult question is whether the gloss of Wilwording v. Swenson (1971), 404 U.S. 249, 92 S.Ct. 407, 30 L.Ed.2d 418, by the Court in Preiser v. Rodriguez (1973), 411 U.S. 475, 93 S.Ct. 1827, 36 L.Ed.2d 439, compels the plaintiffs to seek relief via habeas corpus instead of using the Civil Rights Act (42 U.S.C. § 1983). If the plaintiffs’ sole recourse were to habeas, they could not maintain their federal suit because they have not exhausted state remedies.
The prisoners in Rodriguez brought section 1983 actions seeking restoration of good time credits that had been revoked through disciplinary procedures that they claimed violated their due process and equal protection rights. The Court, stressing that relief would result in either immediate or more speedy release from confinement, held that a writ of habeas corpus was the exclusive federal remedy because the prisoners’ lawsuits were “within the core of habeas corpus in attacking the very duration of their confinement itself.” (411 U.S. at 487-488.) However, the Court expressly reaffirmed its earlier holding in Wilwording that state prisoners challenging on constitutional grounds the conditions of confinement, rather than the fact or length of custody, could properly bring section 1983 actions, thus eliminating the habeas corpus exhaustion requirement. (411 U.S. at 498-499.)
The Clutchette plaintiffs attack neither the fact nor the duration of their confinement. No plaintiff seeks immediate or earlier release from prison. They challenge on constitutional grounds prison procedures which can result in sanctions ranging from loss of privileges enjoyed by the general prison population to prolonged isolation from other prisoners, all of which have a significant impact on the conditions of their confinement. The profile of their action thus appears to resemble Wilwording. However, a closer examination of the features of San Quentin’s disciplinary procedures in the context of California’s Indeterminate Sentencing Act (Cal.Penal Code §§ 1168, 3020-3035), to which these prisoners are subject, requires a reappraisal of their case under the Rodriguez doctrine.
The line established by Rodriguez between proceedings seeking earlier release from confinement and actions challenging the conditions of confinement can be applied in a good time credit system because loss of credits has a direct and specific relationship to release dates. But in California, where good time credits are nonexistent, the line is blurred to the point of inapplicability because disciplinary sanctions have no fixed relationship to the fact or length of incarceration. Under California law, the Adult Authority is empowered within statutory limits to set and to reset the terms of imprisonment of adult male offenders sentenced to prison and to serve as the parole board for such offenders. (Cal. Penal Code §§ 1168, 3020, 5077.) All disciplinary actions against a prisoner are eventually reported to the Adult Authority. The Adult Authority has unfettered discretion to decide what effect, if any, a disciplinary sanction will have on the length of an inmate’s confinement. The Authority can and sometimes does cancel a previously set parole date or reset the inmate’s sentence to a statutory maximum on the basis of even minor disciplinary actions. (See 2 California Bd. of Corrections, Correctional System Study: Prison Task Force Report 36-37 (1971). The relationship between the imposition of a disciplinary sanction and cancellation or postponement of a prisoner’s release date cannot be more precisely identified. The Authority is not obligated to state reasons for its actions (See Parole Board Reform in California, supra note 5, at 16), and, therefore, the causal connection between a record of a disciplinary offense and an adverse response by the Authority is not always evident.
Because the potential effect of disciplinary sanctions on parole dates and length of sentence is so nebulous, we do not think that Rodriguez should be extended to compel the Clutchette plaintiffs to seek all of their relief through habeas corpus. Nor should Rodriguez be read to require plaintiffs to separate somehow those disciplinary proceedings that affect only the conditions of their confinement from those than can have an impact on their release dates, bringing civil rights actions challenging one type and habeas petitions challenging the other. Of course, we could verbally circumvent the problem by limiting the scope of relief available in this civil rights action to those disciplinary hearings that do not affect the length of incarceration time, leaving to prisoners, prison authorities, and state courts the task of deciding which proceedings are within or without our judgment. That course is unacceptable. Rather, we acknowledge that San Quentin’s inmates cannot cast a habeas petition in Rodriguez’ mold because it would be exceedingly rare, if ever, that a prisoner could aver that he would have been entitled to immediate release or release on a date certain had he not been subjected to the disciplinary procedures that he attacks on constitutional grounds. We hold that the speculative and incidental effect of prison disciplinary procedures on the duration of plaintiffs’ sentences is not sufficient to bring any part of this action within the “core” of habeas corpus. Therefore, it was proper for the district court to permit plaintiffs to proceed with their civil action under section 1983 without their having exhausted state remedies.
II.
The plaintiffs retained a residuum of constitutionally protected liberty after they were convicted and incarcerated. Serious inroads on that liberty can be made only by following due process requirements. (Cf. Gagnon v. Scarpelli (1973), 411 U.S. 778, 93 S.Ct. 1756, 36 L.Ed.2d 656; Morrissey v. Brewer (1972), 408 U.S. 471, 92 S.Ct. 2593, 33 L.Ed.2d 484.) Accordingly, our circuit and others have held that those prison disciplinary proceedings that can result in the imposition of “significant” sanctions upon prisoners must be conducted with due process safeguards. (Allen v. Nelson (9th Cir. 1973), 484 F.2d 960, aff’g (N.D.Cal.), 354 F.Supp. 505; McDonnell v. Wolff (8th Cir. 1973), 483 F.2d 1059, cert. granted (1974), 414 U.S. 1156, 94 S.Ct. 913, 39 L.Ed.2d 108; United States ex rel. Miller v. Twomey (7th Cir. 1973), 479 F.2d 701; Gray v. Creamer (3d Cir. 1972), 465 F.2d 179; Sostre v. McGinnis (2d Cir. 1971) 442 F.2d 178; See Palmigiano v. Baxter (1st Cir. 1973), 487 F.2d 1280.)
When the district court decided this case, it had little guidance in drawing a due process line other than the general principle, derived from Mr. Justice Frankfurter’s concurring opinion in Joint Anti-Faeist Refugee Comm. v. McGrath (1951), 341 U.S. 123, 71 S.Ct. 624, 95 L.Ed. 817, that procedural due process protections are due state prisoners subjected to disciplinary proceedings if, as a result of such proceedings, they will be “condemned to suffer grievous loss.” (Id. at 168, quoted in Goldberg v. Kelly (1970), 397 U.S. 254, 263, 90 S.Ct. 1011, 25 L.Ed.2d 287, and in Morrissey v. Brewer, supra, 408 U.S. at 481.) In applying the “grievous loss” concept, the district court recited instances in which deprivations were serious enough to require application of due process and implied that other, less significant disciplinary restrictions of a prisoner’s liberty or property interests might not warrant procedural protections. Other courts have made comparable efforts at defining, at least in part, those sanctions which constitute “serious deprivations” or “grievous loss” so as to outweigh any governmental interest in summary adjudication. (See, e. g., United States ex rel. Miller v. Twomey, supra, Sands v. Wainwright (M.D.Fla.1973), 357 F.Supp. 1062, vacated, 491 F.2d 417; Bundy v. Cannon (D.Md.1971), 328 F.Supp. 165.)
The attempts thus to classify disciplinary sanctions that adversely change a prisoner’s status are predicated
on an erroneous notion of due process. The “schedules” developed, of course, have great relevance to an evaluation of the “weight” of the prisoner’s interests affected by the imposition of disciplinary sanctions. And the relative weight of liberty or property interest has a significant impact on any determination of the formality and procedural requisites of the hearing required in particular circumstances by due process. (Board of Regents v. Roth (1972), 408 U.S. 564, 570, 92 S.Ct. 2701, 33 L.Ed.2d 548; Fuentes v. Shevin (1972), 407 U.S. 67, 90 n.21, 92 S.Ct. 1983, 32 L.Ed.2d 556.) “But, to determine whether due process requirements apply in the first place, we must look not to the ‘weight’ but to the nature of the interest at stake.” (Board of Regents v. Roth, supra at 570-571, citing Morrissey v. Brewer, supra.) That is, we must see if the prisoner’s interest affected is within the Fourteenth Amendment’s protection of liberty and property (see id. at 571); for any prison disciplinary proceeding that impairs a prisoner’s residuum of liberty or adversely affects his property interest (and which is not de minimis) condemns a prisoner “to suffer grievous loss,” as that term is now understood.
It is difficult to imagine any sanction that might be imposed by a prison disciplinary committee which would not constitute a further impairment of a prisoner’s already restricted interest in liberty (or in the case of a fine or a forfeiture of accumulated earnings, which would not constitute a deprivation of a property interest). All the sanctions considered by the district court to constitute “grievous loss” (see note 7 supra) involve an impairment of a prisoner’s surviving interests in liberty and property. Any entry in a prisoner’s permanent file which indicates that he has been found guilty of a violation of prison regulations, whether or not the file is forwarded immediately to the Adult Authority, has an incalculable effect on a prisoner’s eligibility for parole (see, ■ e. g., McDonnell v. Wolff, supra, 483 F.2d at 1064 & n.7; Hudson v. Hardy (1970), 137 U.S.App.D.C. 366, 424 F.2d 854, 856), an effect which without question impairs a prisoner’s interest in “liberty.” Finally, even a temporary suspension of “privileges,” by restricting the prisoner’s activities to a greater extent than the general prison population, constitutes an abridgment of the prisoner’s limited residuum of liberty. (See Palmigiano v. Baxter, supra, 487 F.2d at 1284; cf. Jackson v. Godwin (5th Cir. 1968), 400 F.2d 529, 535.) Indeed, “the distinction between a ‘right’ and a ‘privilege’ — or between ‘liberty’ and a ‘privilege’ for that matter — is nowhere more meaningless than behind prison walls.” (Sostre v. McGinnis, supra, 442 F.2d at 196 (footnote omitted)).
III.
Under the disciplinary procedures existing at the time of commencement of this lawsuit, an accused inmate was visited by a hearing officer within 24 hours of an alleged infraction. The officer orally informed the prisoner of the charges against him. The officer could impose sanctions for minor infractions without any further investigation or hearing, but serious offenses were referred to a disciplinary committee. At the committee hearing, the complaint and, in some cases, a summary of supplemental reports were read to the inmate (but not shown to him), and he was then given an opportunity to explain his conduct. The decision of the committee was recorded and forwarded to an associate warden for approval.
The district court agreed with the plaintiffs’ contention that these procedures did not satisfy the minimum due process standards applicable to prison disciplinary proceedings. In addition to granting declaratory relief, the court enjoined defendants from conducting any further disciplinary proceedings at San Quentin so long as the procedures employed remained constitutionally infirm and ordered the defendants to submit a plan for the conduct of disciplinary proceedings consistent with the court’s opinion. The district court also ordered that the decisions of the disciplinary committee in the hearings of the named plaintiffs be set aside, that the plaintiffs be returned to their predisciplinary hearing status, and that the decisions of the disciplinary committee be expunged from the named plaintiffs’ records and not be referred to the Adult Authority.
It is now axiomatic that the requisites of due process vary according to specific factual contexts. (E. g., Morrissey v. Brewer, supra, 408 U.S. at 481; Goldberg v. Kelly, supra, 397 U.S. at 262-263.) Fashioning the due process formula for each situation requires striking an appropriate balance by identifying and assessing the relative weights of the competing individual and state interests involved. (Cafeteria & Restaurant Workers v. McElroy (1961), 367 U.S. 886, 895, 81 S.Ct. 1743, 6 L.Ed.2d 1230; see Hannah v. Larche (1960), 363 U.S. 420, 442, 80 S.Ct. 1502, 4 L.Ed.2d 1307.)
Every San Quentin disciplinary hearing threatens a prisoner’s small store of protected liberty and potentially his property as well. The severity of the sanction that may be imposed varies and, accordingly, the kind of process due will vary, at least in detail.
The state’s interests in prison disciplinary procedures administered in San Quentin are multiple and also of varying importance. They range from its interest in rehabilitation of the offender, the primary goal of a corrections system which ultimately returns almost all offenders to society, through prison security and “efficient custody” to considerations of economy in using scarce public financial resources.
The least weighty of these interests in the procedural due process scale is thrift. The need for conservation of public financial resources is real. However, the interest in savings that can be realized from depriving prisoners of minimum procedural safeguards designed to enhance fair fact finding is outweighed by the larger public interest in rehabilitating offenders and by the individual prisoner’s interest in clinging to the remnants of his liberty. The Supreme Court has recognized the linkage between the rehabilitative goals of corrections and the conduct of correctional hearings utilizing nonsummary procedures which are fair and which appear fair to the offender. (See, e. g., Morrissey v. Brewer, supra, 408 U.S. at 484; In re Gault (1967), 387 U.S. 1, 26, 87 S.Ct. 1428, 18 L.Ed.2d 527; Millemann, Prison Disciplinary Hearings and Procedural Due Process: The Requirement of a Full Administrative Hearing, 31 Md.L.Rev. 27, 42-44 (1971).) It has also held that an individual’s interest in an adequate hearing cannot be sacrificed to the state’s interests in saving time and money: “Procedural due process is not intended to promote efficiency or accommodate all possible interests: it is intended to protect the particular interests of the person whose possessions [or liberties] are about to be taken.” (Fuentes v. Shevin, supra, 407 U.S. at 90 n. 22; accord, Goldberg v. Kelly, supra, 397 U.S. at 265-266.) The undeniable fact that the imposition of due process mínimums will increase the cost of maintaining San Quentin is not a basis for rejecting plaintiffs’ due process claims.
Prison security and “efficient custody” of the inmates (Palmigiano v. Baxter, supra, 487 F.2d at 1285) are interests that must be accommodated. Without them, San Quentin could not be administered at all. The key word, however, is “accommodation,” not “sacrifice.” In emergency situations in which there is grave risk of physical harm to prison personnel or to inmates from outbreaks of individual violence or riots, immediate action can be taken. But, as the district court observed (328 F.Supp. at 782 n. 13), the state’s interest in achieving security through summary procedures is adequately vindicated by permitting prison officials temporarily to isolate potentially disruptive inmates. (Biagiarelli v. Sielaff (3d Cir. 1973) 483 F.2d 508; cf. North America Cold Storage Co. v. Chicago (1908), 211 U.S. 306, 29 S.Ct. 101, 53 L.Ed. 195.) Once the imminent threat of violence has passed, of course, the prison authorities have no cognizable interest in maintaining the suspected troublemakers in isolation status — or in imposing any other disciplinary sanctions — -without first providing an appropriate hearing.
As we have earlier pointed out, the rehabilitative goal is improved, not impaired, by imposing procedural protections designed to thwart arbitrariness and to enhance the quality of fact finding. A prisoner who receives what he reasonably views as unfair or arbitrary treatment from prison authorities is likely to become a difficult subject for reformation or even for efficient custody. (E. g., United States ex rel. Miller v. Twomey, supra, 479 F.2d at 715; Task Force Report: Corrections, supra at 83.)
We conclude that, except in emergency situations, the inmate’s interest in preserving his slight liberty and his property and the public interest in reaching the rehabilitative ends of corrections outweigh any competing interests that could be promoted by preserving summary proceedings in the conduct of San Quentin’s disciplinary hearings.
IV.
We turn to the task of defining specifically the minimal procedural safeguards that must be accorded to San Quentin’s inmates in all prison disciplinary proceedings. In doing so, we emphasize at the outset that we agree with the district court’s conclusion that our judicial role is properly limited to prescribing the constitutional minimums and requiring the San Quentin administrators to produce a plan which the district court can test against the basic constitutional criteria.
1. Notice — The defendants concede that an essential element in any system of minimum procedural safeguards is providing the accused inmate with specific notice of the charges against him. Adequate notice has been held by our circuit to be an indispensible ingredient of minimum due process in the prison context (Allen v. Nelson, supra), and it has been unanimously viewed as a necessáry safeguard in prison disciplinary proceedings. (See, e. g., McDonnell v. Wolff, supra, 483 F.2d at 1062-1063; United States ex rel. Miller v. Twomey, supra, 479 F.2d at 716, 718; Corrections at 51.) The notice must inform the inmate of the charges against him and of the details of his alleged offense (Morrissey v. Brewer, supra, 408 U.S. at 489); it must be promptly delivered to him and must be received sufficiently in advance of the hearing to enable him to prepare any defense he may have. (McDonnell v. Wolff, supra at 1062; see In re Gault, supra, 387 U.S. at 33.) Moreover, to permit presentation of an effective defense and to facilitate the therapeutic value of a fair and impartial disciplinary hearing, the prisoner should also receive a written explanation of the procedures that will be employed at the disciplinary proceeding and a statement of his rights (and the limitation of those rights) under the hearing rules.
2. The Right To Be Heard and To Present Witnesses — The fundamental guaranty of due process is the opportunity to be heard. Prior to- the imposition of disciplinary sanctions, an accused inmate must have an opportunity to show, if he can, that he did not violate the rule as charged or to explain that, although guilty of the charged infraction, there are mitigating circumstances. (Sostre v. McGinnis, supra, 442 F.2d at 198-199, 203; see Morrissey v. Brewer, supra, 408 U.S. at 489; American Correctional Assoc., Manual of Correctional Standards 409-10 (3d ed. 1966).)
He also has a right to present witnesses and documentary evidence to support his contentions. (McDonnell v. Wolff, supra at 1062-1063; see Morrissey v. Brewer, supra at 489; Corrections at 52.) The ability to produce evidence other than his own testimony is necessary to assure that he will be heard “in a meaningful manner.” (Armstrong v. Manzo (1965), 380 U.S. 545, 552, 85 S.Ct. 1187, 14 L.Ed.2d 62.) Without such a right, relevant exculpatory evidence, not within the personal knowledge of the accused but nonetheless essential to a fair and accurate fact finding determination, may not be heard at all; relevant corroborative testimony and real evidence, frequently important for the defense of a possibly unreliable prisoner, may also be presented for the same purpose. The initial decision concerning the witnesses to be called in his defense should be made by the accused. However, the disciplinary committee has the power to limit the number of witnesses called to prevent repetitiousness and to control the admission of documentary evidence to avoid irrelevant or merely cumulative evidence.
3. The Right to Confrontation and Cross-Examination — Confrontation and cross-examination of witnesses at a hearing help guarantee that the fact finding process is as complete and reliable as possible. Accordingly, “[i]n almost every setting where important decisions turn on questions of fact, due process requires an opportunity to confront and cross-examine adverse witnesses.” (Goldberg v. Kelly, supra, 397 U.S. at 269.) Prison disciplinary hearings, no less than parole revocation proceedings (Morrissey v. Brewer, supra at 489), involve factual determinations and thus must provide an opportunity for an accused inmate to demonstrate that the evidence against him is based on misperceptions or on faulty memories or that it is motivated by malice or prejudice. (McDonnell v. Wolff, supra at 1062-1063; Palmigiano v. Baxter, supra, 487 F.2d at 1290; cf. Greene v. McElroy (1959) 360 U.S. 474, 496-497, 79 S.Ct. 1400, 3 L.Ed.2d 1377. But see Sostre v. McGinnis, supra, 442 F.2d at 196-197.)
Permitting an inmate to confront and cross-examine his accusers may threaten an erosion of traditional inmate-staff relationships. (Millemann, Prison Disciplinary Hearings and Procedural Due Process, supra at 53.) But this concern, based on a desire to isolate prisoners from the correctional staff and to shield the conduct of the latter from scrutiny and criticism, is premised on notions of authority that have recently been questioned. (See, e. g., Corrections at 485-86.) More importantly, to the extent that accommodating this interest is inconsistent with implementation of procedural protections necessary to insure fundamental fairness in those proceedings which threaten prisoners with the deprivation of constitutionally protected interests — such as the right to confrontation and cross-examination of adverse witnesses — the concern for administrative dislocation must yield. (See Fuentes v. Shevin, supra, 407 U.S. at 90 n. 22.)
It is also true that identification of inmates testifying against the accused prisoner, obviously a necessary aspect of confrontation and cross-examination, may lead to reprisals against those testifying. (See generally American Correctional Assoc., Manual of Corrections, supra at 410.) But this concern for the safety of inmates does not justify a wholesale denial of the right to confront and cross-examine adverse witnesses. Rather, prison authorities must attempt to provide protection for testifying inmates in a manner which creates the least interference with the right of an accused prisoner to a fair and reliable disciplinary hearing. (See Palmigiano v. Baxter, supra at 1287-1288. See generally Shelton v. Tucker (1960) 364 U.S. 479, 81 S.Ct. 247, 5 L.Ed.2d 231; Dean Milk Co. v. City of Madison (1951), 340 U.S. 349, 71 S.Ct. 295, 95 L.Ed. 329.) When an actual, legitimate fear of retributive violence exists and usual methods of protecting the testifying inmate (e. g., temporary, protective segregation consented to by the inmate) are inadequate, however, a modification of the usual procedure of confrontation and cross-examination may be justified. But the exact procedures to be used under these circumstances for revealing to the accused inmate the substance of the adverse witness’ testimony to permit him to rebut the evidence and for pro viding the disciplinary committee with an opportunity to probe in camera the credibility of the witness should be, in the first instance, worked out by the prison authorities subject to the approval of the district court. (See Palmigiano v. Baxter, supra, at 1290; cf. Gagnon v. Scarpelli, supra, 411 U.S. at 778, 782-783 n. 5.)
U. A “Neutral and Detached” Hearing Body — Basic to an accused prisoner’s constitutional guarantee of an accurate and fair fact finding determination prior to imposition of sanctions is the right to be heard by an impartial disciplinary committee. (Morrissey v. Brewer, supra at 489; Goldberg v. Kelly, supra at 271; see Corrections, supra at 52.) “[P]ersonal knowledge of, and sometimes bias toward, the inmate defendant, tendency to support staff, and reaction to inmate attitude toward the [disciplinary committee]” may affect the decisions of any prison administrator or staff member sitting on a disciplinary committee. (See Harvard Center for Crim. Justice, Judicial Intervention in Prison Discipline, 63 J.Crim.L. 200, 210 (1972).) And it is likely that most prison officials will have some awareness of at least the more significant disciplinary problems which have arisen within the institution. Nevertheless, provided that no member of the disciplinary committee has participated or will participate in the case as an investigating or reviewing officer, or either is a witness or has personal knowledge of material facts related to the involvement of the accused inmate in the specific alleged infraction (or is otherwise personally interested in the outcome of the disciplinary proceeding), a hearing board comprised of prison officials will satisfy the due process requirement of a “ ‘neutral and detached’ hearing body.” (See, e. g., Morrissey v. Brewer, supra at 489; Meyers v. Alldredge (3d Cir. 1974), 492 F.2d 296 at 305-306; Landman v. Royster (E.D.Va.1971), 333 F.Supp. 621, 653.)
5. A Decision Based on the Evidence Presented — Use of information not presented at the hearing leaves the inmate without any means of rebutting or seeking to mitigate the evidence against him. (See United States v. Abilene & S. Ry. (1924), 265 U.S. 274, 289, 44 S.Ct. 565, 68 L.Ed. 1016.) For the right to confront and cross-examine adverse witnesses to be meaningful, the disciplinary committee must be required to make its fact finding determinations based solely upon the evidence presented at the hearing. (See Goldberg v. Kelly, supra at 271; Corrections, supra at 52.) To insure compliance with this requirement, the committee must state briefly the reasons for its decision and indicate the evidence on which it relied. (Morrissey v. Brewer, supra at 489; Goldberg v. Kelly, supra at 271.)
As we have already indicated, utilization of these procedural safeguards is necessary for any prison disciplinary proceeding to be consistent with the requirements of the due process clause of the Fourteenth Amendment, regardless of the sanction that is imposed. Because the procedures challenged in this case did not meet these mínimums, they ara unconstitutional.
V.
Utilization of the minimum procedural protections heretofore outlined will not be sufficient to satisfy the requirements of the due process clause in all prison disciplinary proceedings. As we have noted several times, the severity of the sanction imposed by a disciplinary committee may vary over a wide range. When the consequences of disciplinary action are most serious, for example, when the inmate is subject to prolonged periods of “isolation,” the balance between the accused prisoner’s interest in procedural protections which assure a fair hearing and the state’s interest in limiting the safeguards is altered, and more “process is due.” (See Morrissey v. Brewer, supra at 481. See also Boddie v. Connecticut (1971), 401 U.S. 371, 378, 91 S.Ct. 780, 28 L.Ed.2d 113.) Thus, while not constitutionally required in every proceeding, in many cases prison officials must provide an accused inmate with either counsel or counsel-substitute. (See Corrections, supra at 52; Task Force Report: Corrections, supra at 86. See generally Gagnon v. Scarpelli, supra, 411 U.S. at 783-791.)
The Supreme Court has long recognized that “[t]he right to be heard would be, in many cases, of little avail if it did not comprehend the right to be heard by counsel.” (Powell v. Alabama (1932), 287 U.S. 45, 68-69, 53 S.Ct. 55, 64, 77 L.Ed. 158.) The need for assistance to permit adequate presentation of a defense is particularly strong in the context of prison disciplinary proceedings because “penitentiaries include among their inmates a high percentage of persons who are totally or functionally illiterate, whose educational attainments are slight, and whose intelligence is limited.” (Johnson v. Avery (1969), 393 U.S. 483, 487, 89 S.Ct. 747, 750, 21 L.Ed.2d 718 (footnote omitted).) Indeed, in large part because of the lack of education of parolees and probationers (most of whom are former prisoners), the Supreme Court last term held that the state’s interest in informality, flexibility, and economy in parole/probation revocation hearings, in most cases, must yield to an accused probationer’s need for appointed counsel whenever the probationer has a colorable claim that he has not committed the alleged infraction. (Gagnon v. Scarpelli, supra at 786, 790.)
In the context of prison disciplinary hearings, as in the parole/probation revocation context, the question of a right to counsel involves a conflict between a prisoner’s interest in avoiding unwarranted restrictions of his liberty and the state’s competing interest in efficient and informal hearing procedures. The defendants have suggested no additional state interest, not present in parole revocation hearings, which, under the principles enunciated in Gagnon v. Scarpelli, justifies denial of legal assistance to an inmate who wishes to assert a factual defense or to present mitigating circumstances. However, in Johnson v. Avery, supra, the Supreme Court held that in some instances the assistance of fellow inmates is an acceptable substitute for the assistance of counsel or “paraprofessionals,” such as law students. (393 U.S. at 490.) Thus, we cannot formulate a per se rule that whenever assistance is required in prison disciplinary proceedings, it must be provided by a qualified member of the bar. (See Palmigiano v. Baxter, supra at 1290-1292.)
Similarly, we cannot now specify precisely when legal assistance is required and when, if required, it must be rendered by a qualified attorney. It is no more appropriate for us than it is for the Supreme Court to write a code of procedure. (Morrissey v. Brewer, supra at 488.) In the first instance it is the responsibility of the prison officials— subject to approval by the district court ■ — to evaluate in the context of the rules of the particular institution the severity of the various sanctions imposed by disciplinary committees and, once some form of “schedule” has been formulated, to decide which types of disciplinary actions are sufficiently serious to require the assistance of a qualified attorney and which require at least “counsel-substitute.” In making these complex evaluations, the prison officials should consider, inter alia, the problems of using staff members to assist the accused inmate which may result from the inevitable conflict between loyalty and responsibility to the institution and a desire to aid one’s “client” (see Harvard Center for Crim. Justice, supra, 63 J.Crim.L. at 208); the desirability of providing “out-
side” counsel or counsel-substitute rather than relying on mutual inmate assistance to limit the instances of inmate “lawyers” gaining coercive power within the prison social structure (see In re Harrell (1970), 2 Cal.3d 675, 685, 87 Cal.Rptr. 504, 470 P.2d 640); the availability of members of the bar through publicly funded and voluntary programs operating in the vicinity of San Quentin; the proximity of the institution to law schools and the extent to which law students may be available to function as counsel-substitute; and the possibility of using paraprofessionals, trained and supervised by qualified attorneys, to serve as counsel-substitute (see Corrections, supra at 26). Accordingly, we hold that the district court properly required the defendants to submit a plan for the conduct of disciplinary hearings at San Quentin consistent with both the minimum due process requirements we have enumerated and the requirement that counsel or counsel-substitute be provided before “serious” sanctions may be imposed.
Finally, we also agree with the district court’s holding’ that a prison er must be afforded counsel (and not merely counsel-substitute) when he is required to appear before a prison disciplinary committee for violation of a prison rule which may also be punishable by state authorities. In Mathis v. United States (1968) 391 U.S. 1, 88 S.Ct. 1503, 20 L.Ed.2d 381, the Supreme Court held that the interrogation of an incarcerated suspect, whether or not intended to obtain evidence for a criminal prosecution and whether or not related to the offense for which the inmate questioned has been imprisoned, is “custodial interrogation” under Miranda v. Arizona (1966), 384 U.S. 436, 86 S.Ct. 1602, 16 L.Ed.2d 694. To protect his Fifth Amendment privilege against self-incrimination, an inmate subjected to such custodial interrogation is entitled to be advised of his right to remain silent and is entitled to have an attorney present — if he wishes — before further interrogation is constitutionally permissible. (391 U.S. at 3-4.) It follows from Mathis that if the disciplinary committee directed questions at the accused inmate, he would be subject to “custodial interrogation” and would have a Fifth Amendment right to remain silent and a right to be represented by counsel (retained or appointed) while subject to such questioning. Failure to recognize these rights would render the disciplinary hearing constitutionally invalid.
Under the disciplinary procedures utilized in San Quentin at the
commencement of this lawsuit, however, inmates were not asked questions by the disciplinary committee. Instead, a prisoner was given standard Miranda warnings (but told that the right to counsel attached only when he was questioned by the district attorney) and then was given opportunity to explain his conduct. We agree with the district court’s conclusion that the “opportunity to explain” was in actuality a subtle form of interrogation. In effect, the disciplinary committee presented the evidence against the prisoner and then said to him, “And what do you have to say about that?” The interrogative nature of the hearing, however, does not depend on an absence of other procedural protections, as the district court apparently concluded. (328 F.Supp. at 779 & n. 7.) A disciplinary hearing is inherently inquisitive. It is designed to induce revelation of all the facts, including the accused inmate’s version of them. The prison disciplinary hearing forces the prisoner into a situation of “interrogative custody,” and the prison authorities must safeguard the inmate’s privilege against self-incrimination. Adequate protection is provided either by postponing disciplinary action until after criminal proceedings have been completed by the courts or by providing the accused inmate with an attorney and advising him of his right to silence pursuant to the requirements of Miranda v. Arizona, supra.
The decree and orders of the district court are modified only to the extent necessary to comply with our opinion; in all other respects the decree and orders of the district court are affirmed. The cause is remanded to the district court for further proceedings consistent with the views herein expressed.
Petition for rehearing has been granted in the light of Wolff v. McDonnell (1974), - U.S. -, 94 S.Ct. 2963, 41 L.Ed.2d -. A new opinion will be later published.
. The district court declared that “the disciplinary procedures employed at San Quentin Prison violate the due process and equal protection clauses of the 14th amendment by failing to provide for adequate notice of charges, the calling of favorable witnesses and cross-examination of accusing witnesses, counsel or counsel-substitute, a decision by a fact finder uninvolved with the alleged incident, a written finding of facts, or uniform notice of any right to appeal the decision, when such a disciplinary hearing may result in grievous loss to the prisoner [.]” (328 F.Supp. 767, 784-785.)
. Section 2281 provides :
“An interlocutory or permanent injunction restraining the enforcement, operation or execution of any State statute by restraining the action of any officer of such State in the enforcement or execution of such statute or of an order made by an administrative board or commission acting under State statutes, shall not be granted by any district court or judge thereof upon the ground of the unconstitutionality of such statute unless the application therefor is heard and determined by a district court of three judges under section 2284 of this title.”
. The defendants do not press the point on appeal as they did below, but the jurisdietionalization of this phase of abstention requires us to consider it. (28 U.S.C. § 2254(b). See Preiser v. Rodriguez, supra, 411 U.S. at 491; Fay v. Noia (1963), 372 U.S. 391, 418-480, 83 S.Ct. 822, 9 L.Ed.2d 837; cf. Wisconsin v. Constantineau (1971), 400 U.S. 433, 437, 91 S.Ct. 507, 27 L.Ed.2d 515.)
. The Rodriguez majority recognized the possibility that a prisoner might want to challenge both the conditions of his confinement and the fact or length of confinement. They noted that the latter claim “under our decision today, is cognizable only in federal habeas corpus, with its attendant requirement of exhaustion of state remedies. But, consistent with our prior decisions, that holding in no way precludes him from simultaneously litigating in federal court, under section 1983, his claim relating to the conditions of his confinement.” (411 U.S. at 499 n. 14.)
. We agree with the district court that the traditional doctrine of abstention is inapplicable to the case at bench. Plaintiffs challenge the constitutionality of the disciplinary procedures utilized at San Quentin. There is no state law issue that can dispose of the case without the necessity of reaching the federal constitutional questions raised. (Compare Railroad Comm’n v. Pullman Co. (1941), 312 U.S. 496, 61 S.Ct. 643, 85 L.Ed. 971.) There is no question as to the meaning or scope of the disciplinary procedures challenged. Thus, there is no saving construction of the procedures that can be made to avoid their constitutional infirmity. (See, e. g., Chicago v. Atchison, T. & S. F. Ry. (1958), 357 U.S. 77, 78 S.Ct. 1063, 2 L.Ed. 2d 1174.) Finally, because there is no impending or ongoing state prosecution or civil action, abstention based on the notions of federalism central to Younger v. Harris (1971), 401 U.S. 37, 91 S.Ct. 746, 27 L.Ed. 2d 669 is not appropriate.
. The district court held that “grievous loss” included a possible increase in a prisoner’s sentence by reason of referral of the disciplinary action to the Adult Authority, fine or forfeiture of accumulated earnings, isolation confinement for more than 10 days, indefinite confinement in the adjustment center or segregation, and referral to the district attorney for criminal prosecution. (328 F.Supp. at 785.)
. It is clear, however, that the weight cannot be so slight that the interest may be characterized as de minimis. (Fuentes v. Shevin, supra at 90 n. 21.)
. The Supreme Court, in another procedural due process context, observed generally that “the meaning of ‘liberty’ must be broad indeed.” (Board of Regents v. Roth, supra at 572.)
. Supra note 1.
. This order was stayed pending appeal, but a plan was voluntarily submitted to the district court. The plan was not made a part of the record on appeal, but it is described in Judicial Interventions in Corrections: The California Experience — An Empirical Study, 20 U.C.L.A.L.Rev. 452, 539-41 (1973).
. It has been estimated that 99 percent of those persons sentenced to confinement will one day return to free society. (National Advisory Comm, on Crim. Justice Stds. & Goals, Corrections 20 (1973) [hereafter cited Corrections].)
. “[T]here are serious practical problems with introducing too many legal controls into the correctional process. Their cost in money and in the time of already overburdened defense counsel and correctional personnel would be great. Given scarce resources throughout the criminal justice system, it is obvious that some priorities must be established.” (President’s Comm’n on Law Enforcement & Administration of Justice, Task Force Report: Corrections 84 (1967).)
. See also Stanley v. Illinois (1972) 405 U.S. 645, 656, 92 S.Ct. 1208, 31 L.Ed.2d 551; “The establishment of prompt efficacious procedures to achieve legitimate state ends is a proper state interest worthy of cognizance in constitutional adjudication. But the Constitution recognizes higher values than speed and efficiency. Indeed, one might fairly say of the Bill of Rights in general, and the Due Process Clause in particular, that they were designed to protect the fragile values of a vulnerable citizenry from the overbearing concern for efficiency and efficacy that may characterize praiseworthy government officials no less, and perhaps more, than mediocre ones.” (Footnote omitted.)
. While emergency isolation need not be based on information which would be sufficient to warrant a finding by a disciplinary committee that the prisoner had engaged in conduct which threatened other prisoners or the prison, such action must at least be predicated on a good-faith determination that immediate action is necessary (see United States ex rel. Miller v. Twomey, supra, 479 F.2d at 717); and the isolation must be accomplished in the manner that, consistent with the maintenance of order in the prison, is least restrictive of the prisoner’s rights and privileges. (Cf. Palmigiano v. Baxter, supra.)
. The procedural rules utilized at the hearing should be flexible, so that it is possible to consider letters, affidavits, and other material that would not be admissible in an adversary, criminal trial. (See Morrissey v. Brewer, supra at 489.)
. Neither the right to confront and cross-examine adverse witnesses nor the correlative right to a decision based on the evidence (see infra) precludes, where appropriate, the use in prison disciplinary hearings of conventional substitutes for live testimony. (See Gagnon v. Scarpelli, supra, 411 U.S. at 782-783 n. 5; compare note 16 supra.) Indeed, even in criminal trials, common law exceptions to the hearsay rule permit some evidence to be admitted without being tested by cross-examination. (E. g., Dutton v. Evans (1970), 400 U.S. 74, 91 S.Ct. 210, 27 L.Ed.2d 213; California v. Green (1970), 399 U.S. 149, 90 S.Ct. 1930, 26 L.Ed.2d 489.)
Similarly, the right to confront and cross-examine means .only that there must be an adequate opportunity to rebut the evidence by facing the Government’s . witnesses. (Goldberg v. Kelly, supra, 397 U.S. at 269, 270.) Thus, there is no constitutional barrier to the use by prison authorities of written reports to support their charges against an accused inmate, provided that the inmate is given a meaningful opportunity to call the authors of the reports as witnesses and subject them to cross-examination. (Palmigiano v. Baxter, supra at 1290; see Richardson v„ Perales (1971), 402 U.S. 389, 407, 91 S.Ct. 1420, 28 L.Ed.2d 842.)
. Nothing we have said concerning the minimum necessary procedural protections should be construed as limiting the saieguards which prison officials may provide. Of course, to the extent that additional safeguards are utilized, they must be made available to all inmates subject to the same class of disciplinary sanction unless there is a rational basis for differentiating between the inmates. Failure to provide such even-handed treatment, as the district court recognized (328 F.Supp. at 784), violates the equal protection clause of the Fourteenth Amendment.
. As described by the district court, isolation involves spending at least 23 hours per day in a cell, which may be a regular 5 feet by 9 feet concrete cell with cot, sink, and toilet or a “strip” cell with a solid door, a mat in place of the usual cot, and a hole in the floor instead of regulation plumbing. Tlie prisoners in isolation eat meals alone and have only vocal contact with other prisoners who may be in isolation except during the brief exercise period. A special restricted diet may be imposed by the disciplinary committee. (328 F.Supp. at 775-777.)
. The Court also held that, presumptively, a probationer has a right to appointed counsel if he has a colorable claim that, despite having committed the infraction, there are “substantial reasons which justified or mitigated the violation and make revocation inappro priate, and that the reasons are complex or otherwise difficult to develop or present.” (Id.)
. In Palmigiano the First Circuit rejected the contention that due process requires that the state furnish counsel in all prison disciplinary hearings, noting that the rules in force in Rhode Island prisons provide for the assistance of counsel-substitute (a classification counselor or other individual specifically approved by the prison administration) if the accused inmate requests help in the presentation of his case. (487 F.2d at 1290.) On the other hand, the court did hold that an inmate should be permitted to bring retained counsel with him into the disciplinary hearing. (Id. at 1291-1292.) Counsel’s role in the hearing, however, was limited to “consultation”; specifically, the court provided that counsel could not participate in cross-examination. (Id. at n. 27.) It is not necessary for us now to reach the question whether there is a -constitutional right to retained counsel which is broader than the due process right to appointed counsel. Consideration of this question, as well as many others relating to the proper scope and implementation of a right to counsel or counsel-substitute, should be left in the first instance to prison authorities under the supervision of the district court. (We note, for example, that the First Circuit’s decision was, to a certain extent, grounded in the fact that existing prison rules permitted intermittant consultation with retained counsel outside the hearing room while the hearing was in progress. The propriety of any such rule is properly first evaluated by the responsible prison administrators.)
We do observe, however, that a serious equal protection question would be raised by any procedure which denied the assistance of counsel to indigent inmates faced with a prison disciplinary hearing but permitted such assistance for wealthy inmates. To be sure, this problem may be mitigated by the provision of counsel-substitute to indigent inmates. Moreover, it has been suggested that a case-by-case evaluation of whether counsel is required, as mandated by Gagnon v. Scarpelli, would avoid any equal protection problems with permitting retained counsel to appear. (E. g., Argersinger v. Hamlin (1972), 407 U.S. 25, 63 n. 31, 92 S.Ct. 2006, 32 L.Ed.2d 530 (Powell, J., concurring).) But in Gagnon v. Scarpelli the Supreme Court considered only a probationer’s due process right to appointed counsel, expressly leaving open the question of a due process right to be represented by retained counsel. (411 U.S. at 783 & n. 6.) By thus limiting its inquiry, the Court also left undecided the extent to which the equal protection clause, under Douglas v. California (1963), 372 U.S. 353, 83 S.Ct. 814, 9 L.Ed. 2d 811 and Griffin v. Illinois (1956), 351 U.S. 12, 76 S.Ct. 585, 100 L.Ed. 891 and their progeny, provides a right to appointed counsel as a necessary concomitant of recognition of a due process right to retained counsel.
. The Supreme Court has consistently invalidated impermissibly coercive governmental actions which have as their goal compulsion of self-incriminatory statements and has attempted to remedy the coercion by returning the injured parties to the status quo ante. (E. g., Lefkowitz v. Turley (1973) 414 U.S. 70, 79-84, 94 S.Ct. 316, 38 L.Ed.2d 274; Gardner v. Broderick (1968), 392 U.S. 273, 88 S.Ct. 1913, 20 L.Ed.2d 1082.) The Miranda Court recognized that custodial interrogation was inherently coercive. (384 U.S. at 445-458.) Without the procedural safeguards it formulated (or equally effective legislative procedures for apprising accused persons of their right to silence (id. at 467)), custodial interrogation was held to be impermissibly coercive. (Id. at 467 — 479.) Accordingly, failure to satisfy the Miranda procedural guarantees when required in a prison disciplinary hearing would render the hearing itself impermissibly coercive; and, consistent with Turley and Gardner, the accused inmate may seek judicial relief from any consequences of the hearing.
. In holding that an accused inmate is entitled to “use immunity” for statements he might make within the prison disciplinary hearing, the First Circuit appeared to assume that a prisoner has no right to remain silent in tiie disciplinary hearing without his silence being used against him. (Palmigiano v. Baxter, supra at 1289-1290.) We agree, as of course we must, that if a prisoner is compelled to answer questions or to explain his conduct under either prison regulations or because he has been advised that his silence will be used against him in the disciplinary hearing, his answers are inadmissible against him in a later criminal prosecution: a prisoner may rightfully refuse to give testimony which might tend to show that he had committed a crime “unless and until he is protected at least against the use of his compelled answers (and evidence derived therefrom) in any subsequent criminal case in which he is a defendant.” (E. g., Lefkowitz v. Turley, supra at 78; Kastigar v. United States (1972), 406 U.S. 441, 92 S.Ct. 1653, 32 L.Ed.2d 212; Garrity v. New Jersey (1967), 385 U.S. 493, 87 S.Ct. 616, 17 L.Ed.2d 562.)
However, as we have already indicated, there is, absent a grant of use immunity, a right to remain silent at a disciplinary hearing without that silence being used against the inmate, based on Miranda and Mathis. Nevertheless, Miranda itself recognized that this right (as well as the right to counsel) may be voluntarily waived by the suspect, provided that he first has been clearly informed of his rights. (384 U.S. at 475.) Similarly, the accused inmate can waive his right to remain silent. To be sure, the inmate faces a dilemma. If he remains silent, he yields a valuable defense and risks serious punishment; if he decides to speak in his own defense at the disciplinary hearing, however, he risks self-incrimination in a subsequent criminal prosecution. But the necessity of making this difficult choice does not render the decision to speak “coerced” nor does it require a grant of use immunity. It has long been held that when a witness voluntarily testifies in a civil or criminal proceeding, he has waived any Fifth Amendment right to object to subsequent use of such testimony. (4 J. Wigmore, Evidence § 1066, at 82 (Chadbourn rev. 1972); 8 id. % 2276 (McNaughton rev. 1961); see Simmons v. United States (1968), 390 U.S. 377, 394 n. 23, 88 S.Ct. 967, 19 L.Ed.2d 1247. See also Brown v. United States (1958), 356 U. S. 148, 78 S.Ct. 622, 2 L.Ed.2d 589.)
In essence then, the prison authorities have a choice: either they can guarantee a right to silence without the silence adversely affecting the accused inmate and provide Miranda safeguards, thus preventing the disciplinary hearing from being impermissibly coercive, in which case there is no right to use immunity if the prisoner decides to speak at the hearing; or they can require that the inmate speak in his own defense (see Gardner v. Broderick, supra, 392 U.S. at 278-279 (dictum); Palmigiano v. Baxter, supra), in which case use immunity follows as a necessary consequence of the compelled disclosures. (Garrity v. New Jersey, supra.)