A few weeks ago, UFC lightweight fighter Melvin Guillard tested positive for cocaine use. The Nevada State Athletic Commission subsequently suspended him for eight months.
Unfortunately, this is not a new trend in mixed martial arts. Though Guillard's positive test has been for what many might consider the most "hardcore" drug, it is by no means the first time a professional MMA fighter has tested positive. Nick Diaz, Diego Sanchez and Joe Pearson have all tested for marijuana. Tim Sylvia, Josh Barnett, Stephan Bonnar, Kit Cope and Vitor Belfort have all tested positive for steroids. Kevin Randleman was suspended by the NSAC for providing fake urine for his drug test, due to his taking banned painkillers and antibiotics for a severe lung infection he was battling. Mark Kerr's various drug addictions were well documented in his documentary, "The Smashing Machine."LINK