I voted for Chael. It is a bit too fresh in our minds, so take that vote for what you will. However, Chael basically did the equivalent of going on a Hunter S. Thompson-like drug binge and then take a piss test to work for the FBI. He must have known he would get caught.
Let's face it, he wanted an out and he got it. Maybe not an out from the UFC/Fox, but he was never going to fight.