The fighters know. If it's painkillers they will say it. If it's weed they will say it. Like Diaz said, if it's steroids or PEDs, its always silence.
This guy had a history with PEDs. Remember dude was like dying and had all types of health issues? Diverticulitis, which is extremely uncommon among young people. It was widely speculated his Diverticulitis was a result of steroids. Of course he claimed otherwise and said it had to do with his huge size and diet, but oh yeah normal people simply cannot get that big and muscular no matter if ur a genetic freak or not. He even got arrested for steroids and then later cleared when it turned out it was growth hormones. Dude is obviously on PEDs.