Matt Riddle
These days, Riddle is a successful member of the WWE. But the former college wrestler began his professional sports career as a UFC fighter. He once allegedly pinned Jon Jones and entered the promotion with a lot of hype behind him. But they cut him after he failed a couple of drug tests (via Sportskeeda).

Riddle revealed that both of the drug tests came after he smoked marijuana. Later, he said that White didn’t practice what he preached and described him as a roid head. The irony is that fighters can legally smoke marijuana out of the competition now. Riddle wouldn’t have an issue if he was in the sport today.