I am not aware of any cheating at my school but I am in the executive program so the students in general are not quite as competitive as the full time students. I can't imagine any of us really thinking that it's worth it to cheat.
We have never had a take home exam (let alone a take home exam that is supposed to be timed). The only real opportunity that I can think of for cheating is to talk to another student who took the exam before you. Another possible way would be to say that you're sick so that you take the exam later and talk to another student who already took the exam.
But that would entail finding another person to collude with you and I think that's pretty tough.
I think GND reduces cheating. There's really no point because unless you're a really poor student you're probably not going to LT the class so you'll pass and you'll be fine. so why cheat?
Anyway, my point is that I don't think there's really any cheating that goes on at Wharton. Of course that's probably just me being naive but oh well.
RVD.