The athlete has returned an adverse analytical finding for the A-sample and the result of the B-sample test is expected from the World Anti-Doping Agency (WADA) accredited laboratory in Lausanne within days, the sources said.
Jamaica Olympic Association president Michael Fennell declined comment, while Jamaica Athletics Administrative Association president Dr. Warren Blake told Reuters his organisation had not been notified of any rule violation.
Following the biggest doping scandal in years, the International Olympic Committee (IOC) has ordered retesting of 2008 and 2012 Olympic samples where traces of drugs that were undetectable at the time now show up under advanced techniques.
The IOC said last month that 31 athletes from six different sports and 12 countries had tested positive in the retesting of 2008 samples and that it had launched disciplinary action against the as yet unidentified athletes who would not be allowed to compete in August's Rio de Janeiro games.
Russia has already said 14 of its athletes were among the positive tests from 2008.
The IOC has said the process of deciding how to reallocate medals after the re-testing of the Beijing and London Games samples was still under consideration.
Jamaica won six gold, three silver and two bronze medals at the 2008 Olympics, all in athletics.
(Reporting by Kayon Raynor; Writing by Brian Homewood; Editing by Gareth Jones)
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