The UFC lightweight champion remains under the UFC’s anti-doping policy this summer as he prepares to box Floyd Mayweather on Aug. 26 in Las Vegas and will still be tested as part of that USADA-run program. In addition, McGregor has been placed in USADA’s pool for professional boxers and is subjected to testing there as well, according to a USADA spokesperson.
“Mr. McGregor is subject to both the UFC Anti-Doping Policy (because he's still an active UFC athlete) and the anti-doping program agreed to for the Mayweather vs. McGregor boxing match,” the spokesperson told MMA Fighting via e-mail.