Francisco Rivera is in hot water with USADA, but poised to present a compelling defense.
The UFC bantamweight was flagged by the agency for a potential anti-doping violation, the UFC announced Wednesday on its website. The statement said the potential violation is in relation to a July 23 out-of-competition sample taken from Rivera.
Rivera told MMA Fighting on Wednesday night in a statement through his Iridium Sports management group that he was told by USADA that he tested positive for clenbuterol.
Rivera, 34, said he was vacationing in Mexico just before the drug test, which is significant in this case.