The Nevada Athletic Commission has confirmed that Nick Diaz tested positive for marijuana at UFC 143 and will face disciplinary action, almost certainly canceling his planned rematch with Carlos Condit and throwing his future into question.
"Mr. Diaz tested positive for marijuana metabolites. A complaint for disciplinary action against Mr. Diaz has been filed," Nevada Athletic Commission Executive Director Keith Kizer wrote in a statement distributed to the media.
After losing to Condit by unanimous decision, Diaz was expected to get a rematch before it became clear that there was an issue with Diaz's drug test. Now Diaz is likely to be suspended at least six months, and possibly longer because he's a repeat offender. Diaz was also busted for marijuana after his upset submission victory over Takanori Gomi in Pride, and that result was subsequently changed to a no contest.
Diaz's future is in doubt not only because the Commission may suspend him, but also because the UFC may decide he's more trouble than he's worth. UFC President Dana White has repeatedly lamented Diaz's refusal to "play the game," and if Diaz can't pass a drug test at the biggest fight of his career, the UFC may not trust him to participate in big fights going forward. There's also the matter of Diaz's post-fight comments, when he said he doesn't know if he even wants to fight anymore.
It's also unclear what will happen with Condit, who was declared the interim welterweight champion for his victory over Diaz. At the moment it appears likely that Condit will sit out until Georges St. Pierre has sufficiently recovered from knee surgery and can return to the Octagon, which is tentatively planned for November.