I believe he did, but only during that lengthy stretch of his peak years.
I do not believe he's currently using anything, as the Tour likely does testing now.
Here's why I believe he used.
During his peak years, he sought out treatment from Canadian physician Dr. Anthony Galea.
He is widely known for his use of HGH (Human Growth Hormone) for his patients, as well as certain other PED's.
Galea also was known for supplying PED's to certain major league baseball...