Nate Diaz tested positive for trace amounts of a selective androgen receptor modulator (SARM) but he has not been provisionally suspended by USADA. Similarly, in May welterweight Neil Magny tested positive for low levels of a SARM, and announced the news himself on his social network. In September USADA cleared Magny to fight, as the amounts were so low, and because Magny was believed to have taken a tainted supplement.

USADA no longer announces adverse test results, and the New York State Athletic Commission was unaware of Diaz’s result until the fighter himself made it public:

I’m not gonna make it out to NYC for fight week next week because they say I tested with elevated levels that they say might be from some tainted supplements. I call false on that cause I only take Whole Food or natural food supplements. I don’t even eat meat. So until UFC, Usada or whoever is F***ing with me fixes it, I won’t be competing. I’m not gonna play their game and try and hide it or keep quiet, as they suggested. I’m not gonna have my name as tainted as a cheater like these other motherf***ers who keep quiet until after the fight just so they can get paid. f***in cheaters. I don’t give a f*** about some money over my dignity and my legacy. I’m not playing along with this bulls***. I’m not staying quiet and figuring it out after the fight. That’s cheating. So fight game I’ll see you when I see you. Sincerely, The releast baddest mother f***er in the game.”

There had been reports the Leon Edwards was available to step in for Diaz, but he’s not.

https://twitter.com/Leon_edwardsmma/status/1187675704382636034

As of now, whether or not the fight takes place remains fluid.

h/t ESPN