I don't know. I'm not fully understanding of how juicing works. Even if you juiced in the past and stopped now doesn't it still have effect now? Or as soon as you stop juicing do the effects of it stop too?
they had will carol talking about that on a podcast a while ago, the basic answer is no one knows. Its really impossible to do a real study since you would have to know who was juicing when. He was guessing about a season until it wore off.
I'd tack Jim Thome, Ryan Howard, and Chase Utley onto the list. Especially with the hip injury.
For retired players, Cal, one of the huge benefits of some of the drugs is increased healing time