Since the majority of professional athletes use it anyway there isn't really a point in restricting it as they will always find ways to go around the system to use it like they have been doing for years.

The thing is though when the majority of athletes are using steroids, when you win against them this still makes you the best if you beat them even if you also used steroids. So the whole, "he didn't deserve his trophies" thing that some people are saying doesn't really make any sense.