News agency, Reuters, is reporting that Jamaican Olympic relay gold medalist Nesta Carter's "B" sample for the use of a banned stimulant at the 2008 Beijing Games has returned positive.
This comes days after it was revealed that Carter's "A" sample had also been tested positive, which could see Jamaica being stripped of the 2008 4x100 metre gold medal.
Trinidad and Tobago finished second in that event.
The Jamaica Olympic Association (JOA) said last Friday in a statement 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 Reuters report says that neither Carter nor his agent has responded to repeated queries for a comment on the positive test.
Carter, who has helped Jamaican 4x100 meter relay teams to Olympic and world championship titles, returned a doping violation for the banned stimulant methylhexanamin in a re-test of 454 samples from the 2008 Beijing Games ordered by the IOC.
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".
Historically, the sanction for the use of Methylhexanamine has been a suspension of six months to a year and the loss of results from the period concerned.
Although his relay teammates Usain Bolt, Asafa Powell and Michael Frater are not accused of doping, it is possible the IOC could strip them of their gold medals due to Carter's B-sample testing positive.
For instance, all members of the victorious American 4x400 relay squad at the 2000 Sydney Olympics were subsequently stripped of their medals after Antonio Pettigrew admitted a doping offence and had all his results from January 1997 onwards disqualified.
However, in other instances team members have been allowed to keep their medals.
When American Marion Jones was stripped of her two relay medals from the Sydney Games for doping offences, her teammates kept theirs after an appeal to the Court of Arbitration for Sport.
IOC spokesman Mark Adams said discussions over what to do with the medals won by any dope cheats exposed by the re-testing were ongoing.
"It is still being worked out," he said. "What we want to do, and are trying to do, is target athletes who have positive results and stop them from competing in Rio."
If Bolt, Powell and Frater lose their relay medals - they could appeal to the Court of Arbitration for Sport (CAS), according to an International Association of Athletics Federations (IAAF) rule.
That rule, IAAF Rule 41, was passed in 2003 and implemented in March 2004.
The rule states, "the relay team shall be automatically disqualified from the event in question, with all resulting consequences for the relay team, including the forfeiture of all titles, awards, medals, points and prize and appearance money" if there is a positive.
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