You might ask how do I know that cheating was nearly non-existent? One, nobody is going to help you cheat. Two, I never knew of anyone who cheated. Three, some classes had more than half of the students fail the exam - hard to believe if there was widespread cheating. And four, I knew a not atypical student who fell asleep during an exam, woke up and finished it, but noted on the exam that he'd been awake for less than the time allotted, but his sleep time exceeded it. He received an apologetic F on it, and had to repeat the class next year. Nobody thought this self-reporting was unusual or particularly worthy of comment. It was just the way it was.