I had a freshmen class where 11 people in a class of 113 got caught directly copying journals you were supposed to maintain over the course of the semester. That's a minimum cheating rate of about 10%.

You can find old surveys asking university students how often they cheat. Let's say they don't paint a positive impression.

It's very feasible for markers to detect that through even cursory review.

They did. That was the whole story.