Swimmer Glauber Silva has been suspended two years and dropped from Brazil\'s team for the London Olympics after testing positive for an elevated level of testosterone, national federation officials said. Silva qualified to swim the 100m butterfly at the 2012 Games. He tested positive at a competition in May in Rio de Janeiro. His suspension began on June 16. Silva argued that the adverse test result from his urine sample had a pathological origin, but the Brazilian federation\'s anti-doping commision did not accept his explanation.