The Nevada State Athletic Commission announced Thursday that at least one UFC 143 drug screen has come back positive.

NSAC Executive Director Keith Kizer (Pictured, file photo) emailed members of the media this morning to announce the news, though the official did not specify whether the to-be-named fighter was flagged for performance-enhancing drugs or drugs of abuse.

“Thank you for the many email[s] and phone calls,” Kizer wrote. “I am still waiting for all the steroid and drug test results to come back. We did have at least one positive test. I will send out an email later today on that matter.”

Rumors have circulated surrounding the drug test results from Saturday’s show, but nothing has been confirmed at this time. UFC 143 took place at the Mandalay Bay Events Center in Las Vegas and was headlined by an interim welterweight title bout between former WEC champion Carlos Condit and onetime Strikeforce king Nick Diaz. Condit earned a unanimous decision victory over the Californian in a competitive bout that sparked dissent regarding the verdict.

The event also saw heavyweight submission ace Fabricio Werdum make a successful return to the Octagon, as the Brazilian showed much improved standup en route to a unanimous nod over Roy Nelson. Additionally, welterweights Mike Pierce and Josh Koscheck battled for three rounds on the main card, with Koscheck edging the Oregonian by split decision.

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