If Lesnar, 6-3, is found guilty of knowingly ingesting the banned drug, he will be handed a two-year suspension.
The failed drug test specifically happened on June 28th and July 9th, right around his return to UFC 200.
Lesnar had returned after a four-and-half year hiatus to defeat Mark Hunt by unanimous decision. It's notable here that this is not the first time Brock Lesnar has been accused of going off script and changing the ending of the match.
The current WWE star faces punishment not only from the United States Anti-Doping Agency, which administered the tests, but also the state of Nevada since that is where the fight took place.
"There is a greater likelihood that these [specified] substances could be susceptible to a credible non-doping explanation", WADA code states. If the athlete decides not to accept the sanction, they can go to arbitration overseen by the American Arbitration Association (independent of the USADA).
According to Ariel Helwani over at our sister site MMAFighting, Brock Lesnar's mandatory vacation from mixed martial arts could be shorter than originally thought.
Hydroxy-clomaphene is one of the substances that interim UFC light heavyweight champion Jon Jones tested positive for in his UFC 200-related drug test.
He is expected to receive a formal hearing with the Nevada Athletic Commission (NAC) at a later date.
Hunt has been outspoken in condemning Lesnar who reportedly earned US$2.5m for his victory.