Couldn't get your link to work, but Google found me this article: LINK
California Fighting for Drug-Free Competition in Boxing, Mixed Martial Arts
12:11 AM PST on Tuesday, February 27, 2007
By DAVID A. AVILA
With mandatory drug and steroid testing poised to begin next month, a state official revealed that 52 professional boxers and mixed martial arts fighters, including Cesar Gracie, Hector Camacho Jr., Bas Rutten and Alfonso Gomez, failed drug tests last year......
When did BAS fail a drug test? He only fought Villarael last year and I don't remember hearing he failed a drug test. Did I miss something? Same goes for Gracie.
I don't follow boxing so I don't know about the other two.