SGG - I'm not sure I agree with that in terms of athletics either. If you look at the WR's and "top lists" for the "heavy throws" (men and women) like shot, discus etc they were all set during a period when steroid use was rife. No-one today is getting even close to those distances.
The same goes for most women's WR's which tend to go back to the'70's and '80's when there was no effective drug testing in place FloJo, Kratochvilova etc).
While it's reasanable to expect WR's to plateau after a time, there's no other plausible explanation as to why performances in some events should appear to have declined to such a degree.
What I cannot understand is why - given the list of athletes who have tested positive as a result of "supplements", from Olympic gold medal winners like Asafa Powell down - any elite athlete would dream of jeopardising their reputation and career by taking them.
Bearing in mind these are full time athletes with all the time they need for training and recovery, access to the best physios and nutrition etc, what possible benefit could supplements bring that would be worth the risk ?
Surely it's very simple - don't take supplements and you won't test positive !