5. Stephan Bonnar
UFC Hall of Famer Stephan Bonnar is one of the very few mixed martial artists to actually admit to taking steroids, though that doesn’t mean he didn’t make excuses for himself.
Bonnar tested positive for steroids following his main event fight with Anderson Silva at UFC 153, a card he was added to at the last minute. At the time he hadn’t fought in almost a year and was recently coming off of knee surgery. Bonnar wasn’t sure if he was ever going to fight again and admitted later he used steroids to recover faster from his surgery.
Dana White would later say that Bonnar told him he was hoping to train in pro-wrestling, thus wanting to recover faster from knee surgery. According to Bonnar experts told him the steroids would be out of his system by the time he was tested for the last minute fight, only they were wrong.
