Shortly after winning this race, Tyson Gay acknowledged failing a drug test. He is believed to have used a cream provided by an anti-aging specialist whose clients include several NFL players, reports ProPublica. Fabrice Coffrini/AFP/Getty Images hide caption

itoggle caption Fabrice Coffrini/AFP/Getty Images

The head of the World Anti-Doping Agency calls Lance Armstrong's lifetime ban "done and dusted." Armstrong is seen here riding in an event in Iowa this year. Matthew Stockman/Getty Images hide caption

itoggle caption Matthew Stockman/Getty Images

American cyclist Chris Horner celebrates winning Spain's Vuelta bicycle race Sunday. Anti-doping officials say that Horner, who at 41 is the oldest ever to win one of cycling's top events, was not at the hotel drug testers visited. Jaime Reina/AFP/Getty Images hide caption

itoggle caption Jaime Reina/AFP/Getty Images