If he knows fighters that are using then he should help the authorities expose them and they may give him a softer sentence. I do not count Floyd as a drug cheat for using pain killers and just because other fighters may use them does not mean he has to. His offence sounds far more serious. Taking a point from @TitoFan post, just because one fighter does it, does not mean they all should. They know the rules and they should follow them.