On the Juice

Are any pro cyclists clean? Now, I don't want to jump to conclusions on this year's Vuelta champion, but it looks like Roberto Heras is at least getting dragged down in alleged EPO use. I don't know the science of these tests. Are these guys just super duper hematocrit producers ... or is everyone on the juice?

Here is the link:
Heras Vuelta sample positive

It seems like the defense of denying everything and paying a lawyer has been successful so far (e.g. Rutger Beke).