Seems like the easy fix here is move all evaluation in-class. Are schools really that reliant on internet/computer based assignments? Actually, this could be a great opportunity to dial back unnecessary and wasteful edu-tech creep.
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On the other hand, kids do blindly use the hell out of ChatGPT. It's a hard call: teach to the cheaters or teach to the good kids?
I've landed on making take-home assignments worth little and making exams worth most of their grade. I'm considering making homework worth nothing and having their grade be only 2 in-class exams. Hopefully that removes the incentive to cheat. If you don't do homework, then you don't get practice, and you fail the two exams.
(Even with homework worth little, I still get copy-pasted ChatGPT answers on homework by some students... the ones that did poorly on the exams...)