Apparently, the Honor System does not apply to exams in grad school, at least it didn't in '62-'63 when I was a 1st year grad student and a couple of us saw 2 other classmates cheating on the exams, comparing answers, etc. The exams were not proctored and we knew ahead of time that the Honor System didn't apply to us. The exams were in the Chemistry Dept. and were courses that many of us required to take to make up for deficiencies in our entrance exams. Justice was served since neither offender was asked to continue (maybe they failed that and other exams).
In Response to: Rally ’Round the Cannon: Honor Thy Whom?