[kangnkodos]

After implementing plagiarism detection campus-wide, design a process which is very time consuming on the students part, and not as time consuming on staff.

Maybe something like: "Your homework was flagged as possible plagarism. Report to this lab at this time, and code one additional problem which should be easy to anyone who understood the original homework."

Anyone who really did the homework will be in and out within five minutes. If you can't finish in an hour, you get a zero on that one homework assignment, not expelled.

That flips the incentives. Also, reducing the punishment cuts the drama of people arguing that the software is not 100% accurate.