Pretty much everyone in the lower level classes is cheating. Some of it's just "driving five-over" and some is practically murder. I've heard Chinese students talking throughout entire exams in big lecture halls, students leaving lab and immediately finding their friends waiting outside for the next lab section and dishing all the details of the day's lab, and students giving away a little too much information when talking about their strategy for a project.
Back then you would hand in printed source code. People would occasionally photocopy someone else's, scratch the name off the title page and write in their own name like I wouldn't notice something that stupid.
I actually caught some phd students in some cheating that was almost as blatant.
The professors generally don't care either. The whole thing burned me out pretty quickly. I realized the school was just full of a bunch of people going through the motions, and CS degrees don't really indicate any particular expertise on their own.