The doping test after stage 17 of the 2006 Tour de France showed he had a very high testosterone\/epitestosterone ratio .
In 2006 , Landis won the first edition of the Amgen Tour of California , before going on to finish first in the 2006 Tour de France . He was stripped of his Tour de France victory and fired from the Phonak team after a drug-control test demonstrated the presence of a skewed testosterone\/epitestosterone ratio during stage 17 .