[Uncle Chip]

George Hincapie(Armstrong teammate) has ridden in more Tours de France than anyone in the history of the race and never tested positive for drugs. He has admitted using them....Tyler Hamilton(also an Armstrong teammate) is another cyclist who passed many, many tests while being a habitual doper.

But ... but ... never mind.

[CharlesWayneCT]

The drug tests set the limit for how you can use drugs. The key is to use the drugs at lower levels than are prohibited by the tests, and at times not prohibited by the tests.

The tests define the limits of the rules, and beating the test is no different than the catcher who is able to convince the umpire that balls are actually strikes, or the wide receiver whose greatest skill is making the ref believe he was interfered with.