The United States Anti-Doping Agency has banned former Olympic gold medallist Jon Drummond for eight years for anti-doping rule violations.

An independent North American Court of Arbitration for Sport panel found that Drummond, now a 46-year-old track and field coach, possessed, trafficked, and administered banned performance-enhancing substances to an athlete.

When he was 31, Drummond helped the United States win the gold medal in the 4x100 metres relay at the 2000 Olympics in Sydney.

USADA CEO Travis T Tygart said: "Coaches have an inherent responsibility to protect athletes - not take advantage of them - but to ensure that they receive the support, training and advice they need to win fairly and in accordance with the rules."

Drummond's sanction prohibits him coaching, training or advising athletes and participating or coaching at any event sanctioned by USA Track & Field, the International Association of Athletics Federations or any other WADA Code signatory.