It seems as if the USADA has proved that Floyd Landis did indeed cheat during the 2006 Tour de France posting an 11 to 1 testosterone-to-epitestosterone (normal range is 4 to 1). Landis is the first tour champ in over 100 years to be stripped of the title. Quite a shame.  He was given a 2 year ban from all cycling and an extra 2 year ban from any racing.

Feel free to read all about it on Velonews.  It is quite a lengthy read.  Also, if interested, they posted an 84 page .PDF file of the full text of the case.