If this is a ntural level then why didn't he test positive in all the previous tests he took? How come only this test, right after the 17th stage was the one he popped a positive? Because they are all dopers, that's why. They entire professional cycling culture is all about doping and has been for decades.
Consider: Armstrong was able to ride better AFTER he got cancer, was able to beat all the other riders that were "cheating." The very riders he bested for seven years were all busted for doping, but yet he was able to beat the fair and square? Not one performer in that sport has any credibility whatsoever and anyone that believes them deserves to be duped into buying swamp land in the Everglades.
Here is the bigger issue: Who really gives a rat's ass and who are the hurting anyway? If there is any harm done it is only to themselves. Whata waste of resources to even go after any of these people. Athelets have always tried to use whatever advatnatge they can get. Let them. Anyone that is truly outraged by any of this is a pompous sanctimonious prick.