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Ethics aside, dude should be expelled just for being dumb. Taking the quiz for the friend was like sticking a loaded gun to your head; you knew there was a chance that it would go off. I mean it's sad that 3 years of grueling work is now down the drain, but from day 1 it's emphasized to the nth degree that the worst/stupidest thing you can do is cheat.
More like, he paid you to take the quiz for him. If he was absent for a legitimate reason, I'm sure he could have been excused. If he overslept and texted you his ID and PW, and you took the quiz for him.......