The back up test of Asafa Powell and four other Jamaican athletes have returned positive results results says source.
All five athletes, Powell, Sherone Simpson discus throwers Allison Randall, Travis Smikle and one junior athlete tested positive at the Jamaica's national championships in June.
The Jamaica Anti-Doping Commission have notified athletes and the results will be passed on to the Jamaican Anti-Doping Disciplinary Panel so hearings can be scheduled.