cycling is well known to be a drug sport...
Controle is more severe and frequent.
In the nineties these guys drove up a mountain at 25 kmph. Nowdays the excesses have gone.
In the last decade two tour de france winners have been caught using (Landis and Rasmussen,w ho was driving in the yellow jersey when they caught him)
as well as numerous top ten guys.
Landis questioning the anti-doping agency is kind of funny since he got caught..