Former world 100m record holder Asafa Powell confirmed on Sunday that he had failed a drugs test. Jamaican star Powell was the second leading sprinter on Sunday to fail a dope test following America\'s former world champion Tyson Gay. \"I will confirm that a sample I gave at the National Trials in June has returned \'adverse findings\',\" said the 30-year-old Powell in a statement released on his Twitter account. \"The substance oxilofrine was found, which is considered by the authorities to be a banned stimulant. \"I want to be clear...that I have never knowingly or wilfully taken any supplements or substances that break any rules. \"I am not now nor have I ever been a cheat.\" Source:AFP