I've taught a graduate-level class in which I caught every single student cheating at least once (18 students), including 6 of them on the final paper (for whic

I've taught a graduate-level class in which I caught every single student cheating at least once (18 students), including 6 of them on the final paper (for which I set an absurdly low bar). I failed those 6, and I gave zeros for all the other individual instances. I should have failed them all.