The backup B sample doping test for Asafa Powell has also come back positive.
The Jamaica Anti-Doping Commission said the former 100-meter world record-holder’s samples were tested at a Montreal lab accredited by the World Anti-Doping Agency.
Powell has been notified and the results were sent to the Jamaican Anti-Doping Disciplinary Panel so hearings can be scheduled.
Powell’s representatives haven’t responded to the findings yet, but they have previously stated that supplements provided by a new physical trainer, Christopher Xuereb of Canada, caused the positive tests.
However, Xuereb suggests he is being cast as a scapegoat and denies issuing performance-enhancing drugs to the sprinter.
Powell tested positive for the banned stimulant oxilofrine at Jamaica’s national championships in June.