officials have athletes to avoid street food that could be contaminated with clenbuterol. The advisory comes days before the games are scheduled to begin in Guadalajara on Saturdaym and a day after the World Anti-Doping Agency announced that it would five Mexican soccer players who tested positive for clenbuterol during last year鈥檚 World Cup. Farmers in Mexico commonly use steroids to beef up their livestock. Charges were against Danish cyclist Philip Nielsen, who tested positive after racing in Mexico. The news could weaken WADA’s case against Alberto Contador, the Spanish Tour de France champion who claims that contaminated Spanish meat is responsible for his positive test for clenbuterol at the 2010 tour. In Spain, supplement regulations are stricter and feeding steroids to livestock is less common, however.
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