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LAS VEGAS (AP) _ The Nevada Athletic Commission has accused Fernando Vargas of having steroids in his system when he lost to Oscar De La Hoya on Sept. 14.

De La Hoya stopped Vargas in the 11th round, adding the WBA 154-pound title to his WBC title.

Marc Ratner, the athletic commission's executive director, said Friday that Vargas' post-fight urinalysis came back positive for stanozolol. It's the same drug that cost sprinter Ben Johnson his gold medal and world record in the 100 meters at the 1988 Olympics.

Vargas is in Hawaii on vacation and could not be reached for comment.

Shelly Finkel, one of his co-managers, told the Las Vegas Review-Journal he isn't sure whether Vargas will dispute the result, but Finkel insisted that if the test is accurate, Vargas must have taken steroids without his knowledge or consent.

After the commission files a formal complaint next week, Vargas will have 30 days to respond. A hearing will be scheduled to determine a punishment. Ratner would not speculate on what type of punishment Vargas could receive.

``We'll all look him in the eye and say, `Why? What happened?''' said commission chairman Luther Mack.

Mack was upset about Vargas' results, especially since the commission warned boxing promoters on July 1 that fighters would be tested for steroids.

``It was a big fight. It was a great matchup pound for pound, a good fight for Nevada, good fight for the fans, and all of a sudden when the fight's over, we have this happen to us,'' Mack said. ``That really bothers me.''