Doping

After the period of doping, between when it is safe to be drug tested and come up negative, would the body not reduce back to it's natural level due to the inability to train above your natural levels?

How? if you continue to train then surely you are still getting the benefit from the period of higher training?

If someone stops taking steroids, the muscles don't simply disappear do they? they can be maintained after that with normal "legal" training.