Oh Alberto?

Alberto Contador has revealed he has failed an anti-doping test for the banned substance clenbuterol during this year's Tour de France.
Contador won the Tour de France for a third time in July, beating Andy Schleck by 39 seconds.
Apparently the quantities concerned are minute and there are previous cases where athletes have been banned and then susequently proved the drug came from contaminated supplements.
After all the drug drama over the past 20 years this is probably the first time I have thought he may not be guilty.
Bjarne Riis has also said that he is certain of Contador's innocence. Who could want for a better reference than that :-).