I really doubt a rider is going to dope any more or any less based on such things as this. For a rider of his ability, it made sense to just take it so easily that day, and not too surprising the change today. He's doped as much as he usually is, however much that is. Relative risk doesn't matter if they can't get caught anyway... this is why riders still doped in 1998, 1999, and they still are in 2007.