I don't think it should be a good idea to legalise drugs in sport. But I heard about the imprecision of doping tests that prohibits athletes to use a wide range of usual drugs for very common diseases like headaches or colds. So I wonder if tests are accurate enough.
I think is difficult to have an strict control about the fair play of everybody in sports, but is important to show them that the control exists and is not easy to escape from them.
Of course athletes are the social victims of drugs. Today it's difficult lo live as a professional of sport. They are absolutely pressed by clubs, federations to win each competition. The media contributes to spread the wrong idea that if they are not winners, they are losers.
Sometimes, sports move too much money. And drug's trade much more.