
Rivera, 36, tested positive for clenbuterol as the result of an out-of-competition urine sample he provided on July 23, 2016. Clenbuterol is a non-Specified Substance in the class of an Anabolic Agents and prohibited at all times under the UFC Anti-Doping Policy, which has adopted the World Anti-Doping Agency (WADA) Prohibited List.
UFC Athlete Francisco Rivera Receives Doping Sanction | USADA
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