hamilton started out as a drug-free rider. but when he joined the u.s. postal service team, he saw veteran riders getting preferential treatment. they would be given white lunch bags between races. he wanted his lunch bag too. >> the doctor at u.s. postal service said that, you know, i had enormous potential. so basically, eventually when i was invited to -- when i was given my first white lunch bag, it was a sign to me that they believe in me, they believe in my potential, and they believe in my long-term talent. >> the lunch bags contained the banned drug epo, designed to raise a cyclist's hematocrit level. >> your hematocrits are a percentage of your red blood cells in your body.