However in a written statement, Kizer revealed that all drug tests came back clean, except for Diaz's.
"The following athletes were tested: Nick Diaz, Carlos Condit, Fabricio Werdum, Josh Koscheck, Renan Barao, Ed Herman, Dustin Poirier, Max Hollaway, Matt Riddle, Henry Martinez, Edwin Figueroa, Alex Caceres, Matt Brown, Chris Cope, Rafael Natal, Michael Kuiper, Stephen Thompson and Dan Stittgen.
All results received thus far have been negative, except Mr. Diaz tested positive for marijuana metabolites. A complaint for disciplinary action against Mr. Diaz has been filed."
Rumors regarding the possible rematch were quickly dismissed after Diaz's manager, Cesar Gracie, confirmed to ESPN.com that the bout was off.
Diaz and Condit battled through a five-round bout for the UFC interim welterweight title, only for Condit to be awarded the victory via unanimous decision.
The result did not sit well with Diaz, or fans, and forced UFC President Dana White to book a rematch between the two welterweights, while current champion Georges St-Pierre remains out of action.
This is Diaz's second drug violation, as he previously tested positive for marijuana in 2006 while competing in PRIDE FC. The bout was ruled a no contest and Diaz received a six month suspension.
There is no word from Diaz's camp, or Diaz himself, regarding this issue at this time.