I think it obvious that all the big hitters have. But look at Brady Anderson, he was a buck nothing and then bulked up and hit something like 52 homeruns.
Nelson, I think pitcher do use AAS, so they can recover from certain injuries faster. That would be interseting if fences were moved back and taller, i think the stats would level off and look more like those players of yester year. On a side note Look at Jerry Rice, he blows out his ACL (a career ending injury 20 years ago, yes surgery has improved since then) and then comes back to play that same year in the playoffs.
All Pro athletes take drugs to improve their performance, it just may not be AAS.
Like dial tone said archers take drugs to calm there nerves. If drugs are out there to improve someones performance then those athletes are taking it.
Great insight from everyone!