Former 100m world record holder testifies about failed test to Jamaican doping commission . Powell says he could not remember the names of all the supplements he was taking . Sprinter was five of one Jamaicans to test positive for a banned substance in 2013 .
Former 100m world record holder testifies about failed test to Jamaican doping commission . Asafa Powell says he could not remember the names of all the supplements he was taking . Sprinter was one of five Jamaicans to test positive for a banned substance in 2013 .