The head of France's anti-doping council says 13 riders from this year's Tour de France have tested positive for drugs, and that only American Floyd Landis did not have a medical excuse for the banned substances.
Pierre Bordry said in an interview with Le Monde newspaper that 12 of the 13 riders had an authorization for therapeutic drug usage. However Bordry expressed concern about the high number of cyclists who had medical excuses for drug use.
Bordry said the high number of medical justifications in the tour, 60 percent of the 105 riders tested, raises serious doubts. He said that riders could be using the medical justification to hide doping.
The International Cycling Union did not seek any disciplinary action against anyone but Landis, who tested positive for high levels of testosterone. The American has been under investigation since winning the Tour, and French organizers say they no longer consider Landis the champion.
The International Cycling Union said its certifications followed World Anti-Doping Agency standards. However the union's chief, Pat McQuaid, told the Associated Press that it is possible some riders could be manipulating the rules to hide doping.