Here's what the young lad should have done, had he had really thought about this: Use a LiveCD to boot with Tor on it, and also tether his cell phone to his computer, so he wouldn't have to go through the campuses wifi. Then the only way they'd have know he used a Tor would be if they checked every student's phone usage -- which would take too long -- and therefore they'd never have found him. Or if they did, they couldn't prove he did it because he used a LiveCD and tor had no trace on his machine.