Gilberto Sanchez Leon fails drug test on Mayweather-Mosley under-card.

[Evil Abed]

With all the attention paid to drug testing prior to the May 1 Floyd Mayweather Jr.-Shane Mosley fight, it's no surprise their drug tests came back clean. All of the fighters on the card were clean except junior lightweight Gilberto Sanchez Leon (29-7-2, 9 KOs), according to Nevada Athletic Commission executive director Keith Kizer. After Sanchez Leon was outpointed by prospect Eloy Perez, his urine sample tested positive for Nandrolone Metabolite (an anabolic agent), Kizer said, adding that Sanchez Leon had been temporarily suspended pending a hearing.

ESPN.