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The fighting future of Brock Lesnar is even more in question after the former Ultimate Fighting Championship heavyweight champion was notified of a potential drug-test failure.

UFC was alerted Friday that the United States Anti-Doping Agency (USADA) told Lesnar, 39, of the potential violation, after an out-of-competition sample collection on June 28. Lesnar returned to UFC on July 9 after almost five years away, earning a unanimous decision over eighth-ranked heavyweight Mark Hunt in the co-main event of UFC 200, a pay-per-view on which Lesnar was the top drawing card. According to UFC, USADAreceived the results from the World Anti-Doping Agency-accredited UCLA Olympic Analytical Lab Thursday night and alerted UFC on Friday.

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“We will get to the bottom of this,” Lesnar said in a statement provided Friday to The Associated Press.

The Associated Press also obtained copies of three letters from USADA to Lesnar, informing the fighter that he had passed tests on three samples submitted over a nine-day period in mid-June, mere days before the sample with the potential violation was collected.