Posted by Ryan Matsunaga @ryanmatsu
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Ryan Matsunaga

Are we about to see yet another Diaz brother suspension?

Hopefully not, but Nate Diaz isn't in the clear yet after his UFC 202 bout with Conor McGregor. Diaz may be facing a USADA violation for vaping a substance called CBD at the post-fight press conference on Saturday night.

Diaz made no attempt to hide what he was doing, and even explained what the substance was.

"[CBD] helps with the healing process and inflammation," Diaz said at the press conference. "So you want to get these for before and after the fights, training. It'll make your life a better place."

CBD, or cannibidiol oil, is one of the active cannabinoids in cannabis. All cannabinoids are banned in competition by World Anti-Doping Agency (WADA) over a certain amount. USADA uses the same banned substance list as WADA, which could spell trouble for Diaz. While it's true that he was using the vape pen after his fight, USADA considers both the six hours before and after a fight to be "in competition."

A USADA spokesperson confirmed to MMA Fighting that the organization is "aware of the situation and is currently gathering information in order to determine the next appropriate steps."

While Diaz was drug tested before appearing at the press conference, he was on camera discussing his use of CBD, which USADA can technically consider as "admitted use." Admitted use carries the same punishment as an actual positive test, anywhere from a warning to a year-long suspension.

Nate Diaz has never failed a drug test in his career, although his brother Nick has three times, all for marijuana. His most recent carried an 18-month suspension and a $100,000 fine.