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US athlete Tyson Gay (L) competes ahead of Jamaica’s Asafa Powell (R) 100m event at the Diamond League Athletics meeting “Athletissima” on July, 4, 2013 in Lausanne. Former world 100m record holder Asafa Powell confirmed on July 14, 2013 that he had failed a drugs test. Jamaican star Powell was the second leading sprinter on today to fail a dope test following America’s former world champion Tyson Gay. AFP PHOTO / FABRICE COFFRINI