Competitors race at the IAAF World Athletics Championship held in Osaka in 2007. Athletes' samples that were kept from the event have now been retested, resulting in suspensions, the IAAF says. Kai Pfaffenbach/Reuters /Landov hide caption

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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

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Sweden's Emma Green Tregaro sports red nails as she waits to compete in the women's high jump final at the 2013 IAAF World Championships in Moscow. Green Tregaro was told her rainbow-colored nail violated track's rules against political statements. Adrian Dennis/AFP/Getty Images hide caption

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