Sure. But the reason to why is a good question. I'm sure many or most of them are forced to do it. Not to have a better chance to win, in that case less would use drugs, but I think they get in trouble if they dont follow trainers and other high status institution secret rules in their world. I saw many examples of people 'getting caught' trying to say what's going on in a covert way in interviews. Who knows.. maybe it's already decided in advance who they gonna frame.