The World Anti-Doping Agency have appealed to the Court of Arbitration for Sport over the decision to clear US sprinter LaTasha Jenkins for doping.

In July 2006, Jenkins, who is believed to be the first to win an appeal against the US Anti-Doping Agency, tested positive for the steroid nandrolone and received a two-year ban.

A three-member arbitration panel ruled in December in her favour after she complained that labs in Belgium and Germany did not follow proper WADA procedures during the handling of her samples.

The panel ruled that both labs erred by not...