'%20x='0'%20y='0'%20height='100%25'%20width='100%25'%20%0A%20%20%20%20%20%20%20%20%20%20xlink%3Ahref='data:image/jpg;base64,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'%3E%3C/image%3E%3C/svg%3E)
#4. Josh Barnett (UFC heavyweight)
There may be no one more familiar with failure than Josh Barnett when it comes to PED usage in MMA. A three-time offender, Barnett has arguably suffered more for his failed drug tests than any other fighter in history.
Josh 'The Babyfaced Assassin' Barnett won the UFC heavyweight championship by defeating Randy Couture at UFC 36. However, it would be a short title reign as Barnett's drug tests came back positive for boldenone, nandrolone and fluoxymesterone. Apart from being stripped of his title, Josh Barnett was also handed a six-month suspension from the NSAC. As drug testing wasn't prevalent in the UFC's earliest years, Barnett believed he was set up and blamed the promotion for his failure.
According to reports, Josh Barnett had previously tested positive for two different anabolic steroids following his victory over Bobby Hoffman at UFC 34. While he was let off with a warning, Barnett's first positive steroid test inspired Nevada to regularly test UFC fighters for performance-enhancing drugs.
In 2009, Josh Barnett single-handedly brought down the Affliction organization by testing positive for drostanolone 11 days before a highly anticipated bout with Fedor Emelianenko.
#3. Jon Jones (UFC light heavyweight)
There is always going to be a question mark over Jon Jones' greatness, owing to the controversies he has been involved in outside of the octagon.
However, there has been nothing more detrimental to his fight career than the four-year ban he faced for failing the USADA drug test one day before his rematch against Daniel Cormier at UFC 214.
But this was neither the first nor the last time Jon Jones tested positive for a banned substance. 'Bones' had previously been handed a one-year suspension by the USADA due to a failed drug test before his UFC 200 clash against Daniel Cormier. Jones would use the same performance-enhancing substance before his fight against Alexander Gustafsson at UFC 232, leading to a shift in venue for the event from Las Vegas to Los Angeles on a six-day notice.
While Jon Jones maintains he hasn't been cheating intentionally, his achievements inside the octagon will always remain controversial.
