The best-known riders often face the most scrutiny.
Ullrich had 10 anti-doping controls by various agencies while training for the Tour -- including three straight surprise tests on three consecutive days after the Giro, Heinrich said.
But even with such controls, the cat-and-mouse game is likely to continue.
"It's human nature to try to cheat the system. It happens in cycling, it happens in business," said Australian Michael Rogers of T-Mobile. "You can't control everyone -- unless they want to have a chaperone that sleeps with the person every night."
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