Don't let anyone tell you that there's dope involved in the TDF, ever!
The bottom line is that big money has too much invested in the business of cycling, and particularly the TDF. And as we know, money doesn't talk, it barks out commands and orders.
Basically, what isn't tested for, isn't found. Is there an agreement that certain drugs/doping techniques are tested for while others are not? Maybe, just maybe.
The list below makes interesting, albeit tragic reading.
Viva the beautiful sport, viva.