The International Motorcycling Federation has issued James Stewart a 16-month suspension following a positive drug test for amphetamine. The suspension is backdated to April 12 when Stewart tested positive for the prohibited substance at the AMA Supercross round in Seattle, which means he will be ineligible for competition until Aug. 11, 2015.

Stewart to argued his case before the Anand Sashidharan of the FIM’s International Disciplinary Court (CDI) on Oct. 23, explaining how amphetamines may have entered his system. The CDI accepted the explanation but ruled Stewart still violated the FIM’s Anti-Doping Code which states that “[i]t is each Rider’s personal duty to ensure that no Prohibited substance enters his or her body(…)”.

The CDI considered the circumstances including that this was Stewart’s first anti-doping violation before issuing the 16-month suspension. The Yoshimura Suzuki rider has three weeks to lodge an appeal but unless the suspension is overturned, Stewart will miss the entire 2015 AMA Supercross season and all but the final two rounds of the 2015 AMA Motocross season. Stewart will also be stripped of his results from the races he competed in following the positive test which includes four rounds of the 2014 Motocross championship and the final three rounds of the AMA Supercross championship.

[Source: FIM]