DECISION
PER CURIAM:
T1 Masooda Syed petitions for review of the decision of the Workforce Appeals Board (the Board) affirming the denial of unemployment benefits based upon Syeds discharge for just cause. This matter is before the court on a sua sponte motion for summary disposition. We decline to disturb the Boards decision.
1 2 Syed does not dispute the Boards conclusion that theft of money from a donation box located inside the business constitutes just cause to support termination. Instead, Syed argues that the Board erred in finding that she had stolen money out of the donation box. Syed asserts that she was set up to make it look like she had stolen the money because her supervisor did not like her and because she was due a substantial amount of severance pay since her position was about to be eliminated due to a reduction in force.
13 This court will reverse an administrative agencys findings of fact only if the findings are not supported by substantial evidence. Drake v. Industrial Commn, 939 P.2d 177, 181 (Utah 1997). Substantial evidence is that quantum and quality of relevant evidence that is adequate to convince a reasonable mind to support a conclusion. Smith v. Workforce Appeals Bd., 2011 UT App 68, ¶ 9, 252 P.3d 372. Furthermore, appellate courts will not reassess an agencys credibility determinations or reweigh the evidence in a proceeding where conflicting evidence is presented. See Questar Pipeline v. Utah Tax Commn, 850 P.2d 1175, 1178 (Utah 1993). Rather, it is the agencys prerogative to assign weight to conflicting witness testimony. See id.
14 In its decision, the Board deferred to the Administrative Law Judges (ALJ) credibility determination. The ALJ heard testimony from both Syeds supervisor, who placed the marked bills in the collection box, and Syeds manager, to whom Syed confessed that she had stolen the money. The ALJ also heard Syeds testimony that she had not stolen the money. After hearing all of the testimony, the ALJ found that the companys witnesses were more credible than Syed. Furthermore, the Board found that Syed provided no evidence to support her accusations that she had been set up. Therefore, there is substantial evidence in the record to support the finding that Syed took the money from the donation box.
15 Accordingly, we decline to disturb the Boards decision.