He`s out the world champs
http://www.bbc.co.uk/sport/0/athletics/23307913Tyson Gay and Asafa Powell: Olympic sprinters fail drug tests
US sprinter Tyson Gay and Jamaica's former 100m world record holder Asafa Powell have failed drug tests.
Gay, 30, the joint-second fastest man over 100m, was notified by the US Anti-Doping Agency on Friday that his A sample from an out-of-competition test in May had returned a positive. Powell tested positive for a banned stimulant while competing in June's Jamaican championships.
Fellow Jamaican athlete Sherone Simpson also failed a drug test at the event. The sprinter, a 4x100m relay silver medallist at last year's London Olympics, tested positive for oxilofrine - the same stimulant Powell tested positive for.
Powell and Simpson's doping positives come a month after Jamaican Olympic champion Veronica Campbell-Brown tested positive for a banned diuretic.