Brock Lesnar failed two drug tests, one about ten days prior to UFC 200 and his fight night test. Unfortunately the results of that first test did not come back until after the event and Lesnar fought and beat Mark Hunt at the event.
Although no official suspension has been placed on Lesnar by the USADA or NSAC, today the Nevada commission did place a temporary suspension on the heavyweight until a full review can be completed:
Former UFC heavyweight champion Brock Lesnar was issued a temporary suspension on Tuesday by the Nevada Athletic Commission (NAC), marking the first step in the adjudication process for Lesnar’s multiple UFC 200 drug testing failures.
Lesnar, 39, tested positive for the banned substance hydroxy-clomiphene, an anti-estrogen agent, in an out-of-competition drug test administered by USADA on June 28 as well as an in-competition test taken at UFC 200. The WWE superstar was tested by USADA eight times in advance of his July 9 fight against Mark Hunt, which Lesnar won via unanimous decision, though the positive test results only came back after UFC 200.
Lesnar is expected to receive a formal hearing with the NAC at a later date. He faces a potential two-year suspension from both USADA and the NAC, as well as fines from the latter — a sentence that would effectively end his mixed martial arts career.