There are some other things to consider when it comes to Alberto Contador's positive dope test. The amount of clenbuterol found in his urine, for example.

The concentration found by the WADA accredited laboratory in Cologne was estimated at 50 picograms (or 0,000 000 000 05 grams per ml), which is 400 times less than what the antidoping laboratories accredited by WADA are required to detect.

In other words, there was almost no clenbuterol in his urine.

One of the doctors that Contador has talked to is Dr. Douwe de Boer who said "there are numerous documented cases of humans ingesting Clenbuterol accidentally by eating meat from animals that have been fed the substance to stimulate growth."

We should take the information with a grain of salt, as de Boer stand up for Contador himself. But still, the concentration is so low that it hardly can be detected anywhere else.

Had another laboratory had access to the same sample, there wouldn't be any talk about doping today. Sometimes so little is necessary for a disaster to happen.

Anyway, at the press conference Alberto Contador told about the meat accident. The organiser of the Vuelta a Castilla y León, José Luis López-Cerrón, brought some meat to the the team's chef, who made a dish of it and Contador ate it. Other riders had ate it as well, and was (in such case) contaminated too. But only one other rider was tested that day, Alexandre Vinokourov, who had an earlier dinner and didn't eat with them. According to Contador, of course. What do you think of that? Excuse or not?