Does Tyler Hamilton's book give any clues as to how they did it? There's a pro who has admitted to doping.
I know when I was in high school for our physicals we needed to compete in sports we had to take a piss test. The guy next to me offered to buy my cup of piss, but it'd taken me like 15 minutes to work it out so I wasn't giving it up to anyone. I'm sure professional athletes have more stringent controls on them than that, but I heard of a pro football player getting busted with something called the Whizzinator.
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Bikes: 1996 Eddy Merckx Titanium EX, 1989/90 Colnago Super(issimo?) Piu(?), 1990 Concorde Aquila(hit by car while riding), others in build queue "when I get the time"