According to the WSJ, Floyd (I think that's his name) was Lance's former teammate who won the Tour but was then stripped of his title after being charged for doping. So, him (along with other cyclists) came 'clean' and basically confessed to everything (e.g hotel rooms turned into like hospital areas -- taping all light fixtures to prevent possible microphones, etc.). And the charges is all in a 15 paged letter.
The things people do when they're desperate (referring to Floyd). "If I'm going down, you're all going down with me!"
online.wsj.com/article/SB10001424052702303734204577464882123553256.html