LAUSANNE, Switzerland (AP) — Sport’s highest appeals court has upheld the lifetime doping ban for Jamaican sprinter and former world relay champion Steve Mullings.

The Court of Arbitration for Sport (CAS) says it dismissed the 30-year-old runner’s appeal of the ban imposed by the Jamaican Anti-Doping Commission in November 2011 after his second drug offence.

Mullings tested positive for furosemide, a banned diuretic and masking agent, at the National Trials ahead of the 2011 World Championships. Mullings had previously served a two-year ban after testing positive for methyltestosterone in 2004.

Mullings won gold in the 4×100-metre relay alongside Usain Bolt and Asafa Powell at the 2009 worlds.

CAS says its panel rejected the athlete’s claims that his 2011 test was “unreliable” and there were “problems” with the 2004 result.

“The athlete had not presented any basis to challenge the testing procedure of the 2011 sample,” read the CAS judgement.

“Furthermore, while Mullings has attempted to raise suspicion about his first violation the CAS Panel did not find that the circumstances surrounding the first offence did warrant a more lenient sanction and, accordingly, it confirmed the lifetime ban.”