Jamaican Olympic sprint relay gold medalist Nesta Carter has returned a doping violation for a banned stimulant after the re-testing of 454 samples from the 2008 Games, two sources familiar with the case told Reuters.
The Jamaica Olympic Association (JOA) said in a statement on Friday it had received notification from the International Olympic Committee (IOC) that one of its competitors had returned an adverse analytical result but did not name the athlete.
The JOA said results management protocols require that they "maintain confidentiality of the result of all doping controls and the identities involved in the proceedings until it has been determined in a hearing."
Jamaica Athletics Administrative Association president Warren Blake said his organization had not been notified of any rule violation.
The sources, who spoke on condition of anonymity, said traces of Methylhexanamine were discovered in Carter's "A" sample, part of a batch of 454 from the 2008 Beijing Games the IOC ordered to be re-tested.
Carter could face sanctions if his "B" sample also tests positive.
Reuters has not seen the laboratory results.
Neither Carter, who won the 4x100-meters relay along with compatriots Usain Bolt, Asafa Powell and Michael Frater in Beijing, nor his agent replied to repeated requests for comment.
Methylhexanamine has been on the World Anti-Doping Agency (WADA) Code prohibited list since 2004 although it was reclassified on the 2011 list as a "specified substance."
With your current subscription plan you can comment on stories. However, before writing your first comment, please create a display name in the Profile section of your subscriber account page.