A post-fight drug test revealed Nick Diaz had double the amount of allowable marijuana metabolites in his system, according to the Nevada State Athletic Commission, which received his testing results on Tuesday following a decision loss to Anderson Silva in UFC 183’s headliner.

Marijuana metabolites in Diaz’s urine sample were measured at 300 nanograms per milliliter (ng/ml), NSAC Executive Director Bob Bennett today confirmed with MMAjunkie. The level is double the 150 ng/mL limit set in 2013 after the World Anti-Doping Agency (WADA) and NSAC raised its testing threshold.

Bennett said Diaz had also risked not being licensed for the event when he did not provide a clean drug test to the commission per a previous suspension for marijuana.

“I want to say that around (Jan.) 28th, I notified the UFC that he would not be able to fight unless we got a test that showed he was clean,” Bennett said.

Diaz (26-10 MMA, 7-7 UFC) was cleared to fight Silva (34-6 MMA, 17-2 UFC) at the Jan. 31 event, which took place at Las Vegas’ MGM Grand Garden Arena and aired on pay-per-view. His license reportedly came after he took several drug tests given to him by his camp. His longtime coach, Cesar Gracie, told MMAFighting.com that they were confident he would pass the test.

Gracie denies, however, that Diaz smoked marijuana between his clean pre-fight test and the post-fight test that produced a positive.

“What we think happened is the exertion of the fight affected the test and that’s why he tested positive,” said Gracie, who declined additional comment to MMAjunkie.

It was the third time Diaz failed a post-fight test for pot in Nevada. He was first caught following a submission win over Takanori Gomi at PRIDE 33 in 2007. At his hearing, commission officials noted he had 175 ng/mL of metabolites in his system, which they said may have helped him be “numb to the pain” and win the fight. He was suspended six months, fined $3,000, and had his win overturned to a “no contest.”

Five years later, Diaz failed a post-fight drug test following a unanimous-decision loss to Carlos Condit in a bout for the UFC interim welterweight title at UFC 143. Diaz appealed the commission’s ruling, arguing that the amount of metabolites in his system, 25 ng/mL, proved he hadn’t used the drug in-competition and therefore hadn’t broken the rules.

Gracie then said Diaz’s weight cut may have contributed to the positive test. The commission struck down his appeal and handed him a one-year suspension and a $79,500 fine, which represented 30 percent of his pay for his fight. An attempt by Diaz and his attorney to challenge the suspension in court was unsuccessful.

In September 2013, the NSAC raised the testing threshold of marijuana metabolites to 150 ng/mL, or triple the amount of 50 ng/mL. The original threshold was 15 ng/mL, but the commission upped the limit after being warned of false positives.

The shift, which was first made by WADA, reflected a relaxed attitude toward out-of-competition marijuana use, as the 150 ng/mL limit was unlikely to catch users out-of-competition and focus on in-competition use, which is considered 12 hours before a competition.

Diaz will soon receive a formal complaint from the NSAC, which will likely suspend him at a meeting on Feb. 17 in Las Vegas. As for what punishment he receives for his third offense, Bennett said it was likely to be in line with his previous fine.

Of course, for Diaz’s UFC 143 appearance, he was paid $200,000 to fight Condit, and he also took home a $65,000 fight-night bonus as well as a pre-negotiated $300,000 bonus for attending pre-event press conferences. His fine, however, was only taken from his fight purse and bonus.

This time around, Diaz received a disclosed $500,000. Any additional money he received may go on the table at the upcoming NSAC meeting.

“Quite honestly, I have no idea what the commission is going to do,” Bennett said. “I couldn’t see them going any lower than what they did last time.”

For more on UFC 183, check out the UFC Events section of the site.