The California State Athletic Commission is investigating hand wraps originally on the fists of Antonio Margarito prior to his loss Saturday night to Shane Mosley.
The two pieces of gauze allegedly had a "plaster-like substance" on them. The CSAC expects results "promptly," according to a report in the Los Angeles Times.
The commission forced Margarito to rewrap his hands after Mosley's trainer, Nazim Richardson, reviewed the original wraps and found them to be too thick. Extra pads and the harder substance were found. The hands were rewrapped, and Margarito suffered a ninth-round TKO.
Richardson said the wraps were doctored in a "deliberate" manner, according to the New York Post.
Richard Schaefer, Mosley's promoter, told the Times that "it's more than additional gauze, that's not a good thing to say. There was a white pad with a substance that was a grayish, concrete color on it. The thing is, you wonder now how many times he did it before."
Todd duBoef, president of Margarito promoter Top Rank, said he believed the commission only took "additional gauze."
Past opponents of Margarito are watching the outcome of the commission investigation with interest. Attorney Pat English, who represents Kermit Cintron promoter Main Events and Vinny Scolpino, the manager of Joshua Clottey, sent a letter to the commission on Tuesday to alert the panel of their interest.
"We have seen many allegations in this sport and will form no conclusions until the wraps are tested," English wrote. "However, if they test positive for an illegal substance a logical question will be whether the illegal substance was used in other bouts, and we will ask the commissions of the other states where Margarito fought to make appropriate inquiries."
English asked the commission to forward any test results related to the case.
Margarito has twice knocked out Cintron in welterweight title fights, the only two losses of his career. The most recent time came in April 2008 in Atlantic City, N.J., two bouts before Margarito faced Mosley.
Margarito retained a title via unanimous decision against Clottey in December 2006, also in Atlantic City. Clottey would go on to later win a world title.
"[Margarito's] tainted everything he has done," Hall of Fame trainer and HBO broadcaster Emanuel Steward told the New York Post. "Now you've got a situation where every fighter that he has fought is wondering, 'Did he do that to me?' I hate this happened because it makes it where there are questions about everybody he has fought."
Information from ESPN.com's Dan Rafael is included in this report