People did forget that berto did come off of a serious injury to his shoulder/arm when a doc says look if u wanna fight again take this steroid to help heal your body. You will take it but prior to the injury I believe he was clean. Maybe if the fight was set at a later date he would have been clean. I'm glad mayweather started this movement in boxing to clean up the sport it just doesn't make since to me how PAC man can get knocked down by Marquez but runs thru bigger and much better opponents. All of his last fights have been catch weights and disadvantage fights love watching him but as a man he should want to take the test to prove for the sport that the best fighters are truly the best because of there hard work and dedication not because a trainer or doc is giving them something to help them not feel pain in the ring lol