you will never have a fair competition because all people are born different - people have differing testosterone levels, differing body builds, differing muscles mass, etc. most competitive sports are plagued with doping because hard work only takes you so far before your body hits its limit.
just let the olympics and shit be a showcase and celebration of what humans can accomplish, fuck it make doping legal as well, i wanna see how wild humans can get
It already is though.
Not at lower levels, which is where most athletes are anyway. I'm sure the odd high schooler is doping, but that'd shoot way up if it was unbanned and scholarships were still on the line.
At the lower levels sure. But in Australia doping is pretty extensive in the upper high school levels, especially since many Olympians are competing while still in school (Ian Thorpe (who probably didn't dope) started with the Australian team at 14). Not so much in Football and Rugby, but its growing too.
(Source: Am Molecular Biology Grad and know people in the Sports Sciences.)