Students were assigned to juries after scores on a measure of moral judgment were equalized for groups. Subjects were seated in a courtroom where a moot court trial of a case of criminal insanity was enacted by law students. Two juries deliberated separately in separate chambers. The control jury registered verdicts individually, were retested, and dismissed. Experimental juries registered verdicts individually before deliberation and were retested after deliberation. Jurors were post-tested again one week later and recorded their personal verdicts. All jurors became more anxious and less hostile as a result of the trial. Subjects whose verdicts were consistent throughout had a significantly higher initial level moral judgment, and significantly so on the one-week post-test.