As I said, I'm conflicted about my own policy.

Part of it is necessary time saving measures for myself. I do my best in teaching, but I also have limited time. I don't really have the time to investigate whether someone actually used AI or not, and I don't have time to give oral exams either. When I ran it by other profs, they actually thought it made sense and was fair, as long as I'm upfront about it at the start.