Despite Brock Lesnar's UFC 200 fight being billed as a one-off, he is still under contract, according to MMAFighting.com. Lesnar's future in the Octagon will depend on whether Vince McMahon ever clears him to fight again while he is still under contract to WWE, but Lesnar is in fact also still signed to a UFC deal.

Due to his being under contract, Lesnar will continue to be tested by the U.S. Anti-Doping Agency as part of the UFC's anti-doping policy. Lesnar will continue to be tested by the USADA until he informs them that he has retired from UFC competition.

USADA rules state that a fighter is supposed to inform them if they are coming out of retirement four months prior to a fight so testing can begin. This rule was waived for Lesnar's UFC 200 fight, but he was tested six times in the month leading up to the fight.

Lesnar was exempt from this rule due to the USADA not being in charge of UFC's anti-doping policy while Lesnar was an active fighter in 2011. He was essentially treated as a new fighter coming into the UFC.

Word is that Lesnar indeed wants to fight again, possibly as early as later this year, but it will depend on whether WWE clears him again.