To address criticisms of the American jury system, the present study examined the effects of psycholegal knowledge on a mock jury decision-making task. Psycholegal knowledge was obtained by completion of a university course on psychology and law focusing on jury decision-making. It was predicted that psycholegal knowledge would enhance juror competence, motivation, and satisfaction with participation in the legal process. Mock jurors who had completed or had not taken a psychology and law course were shown a videotape of a rape trial and participated in jury deliberations. Jurors trained in psycholegal knowledge voted for acquittal more often than those who were not. Additionally, trained jurors were more satisfied, were more confident that their jury reached a correct verdict, and believed more that their jury's decision was based on the evidence presented than did untrained jurors. Content analysis of jury deliberations found that trained jurors were more task oriented and focused on relevant evidence than untrained jurors. The feasibility of implementing a juror training program prior to jury service was discussed.