LAS VEGAS (AP) -- The head of the Nevada Athletic Commission says UFC welterweight Nick Diaz tested positive for marijuana after his recent loss to Carlos Condit and faces disciplinary action, including a possible suspension and fine.
Executive director Keith Kizer said Thursday that Diaz's license has been temporarily suspended and he will have 20 days to respond to the allegations.
Kizer says the allegations have not been proven, and Diaz will be able to defend himself if he chooses to.
Diaz lost the co-main event on Saturday night for the interim welterweight title and a shot to fight Georges St-Pierre. He was visibly upset at the loss and hinted at retirement.
Kizer says Diaz lost his license for six months and was fined $3,000 after another positive marijuana test in 2007.