2010 Tour de France
In September 2010, Contador revealed that a urine sample he had given on 21 July, a rest day in the 2010 Tour de France, had contained traces of clenbuterol. He has stated, due to the number of other tests he passed and that only a tiny amount of the substance was detected in the one he failed, that food contamination was to blame.[82] Renowned anti-doping doctor Don Catlin considered this explanation plausible.[83] Contador stated that he is the victim,[84][85] and he can "hold his head high" and that he thinks he should not be punished.[86] Several people related to the sport said that there is little benefit from using the drug, especially in the amounts that were discovered.[87][88][89]
The UCI issued a statement reporting that the concentration was 50 picograms per millilitre, and that this was 400 times below the minimum standards of detection capability required by WADA, and that further scientific investigation would be required. Contador has been provisionally suspended from competition, although this had no short-term effect as he had already finished his racing programme for the 2010 season.[90][91][92] Contador had been informed of the results over a month earlier, on August 24.[93] Later the amount discovered was clarified as 40 times below the minimum standards, rather than the 400 times originally reported by the UCI. Contador's scientific adviser claimed that he would have needed 180 times the amount detected to gain any benefit in his performance.