Right. He's made this harder for himself than he needs it to be. The honeypot is fine. If it were me I'd warn the class that I've seeded the internet with bull

Right. He's made this harder for himself than he needs it to be. The honeypot is fine. If it were me I'd warn the class that I've seeded the internet with bullshit answer keys, and while I'll never be able to prove you used one of them, you'll probably fail if you do. And leave it at that. Instead he's guessing a threshold, and can't really be sure if someone that insists they didn't cheat is lying or not, with high stakes. It's a bad situation for all involved.