Just google "Olympic 2016 drugs" and you'll see that, yet again, there's been umpteen disqualifications for "drugs cheating".
I'm just wondering why. Not "Why do they take drugs?", that's obvious. I'm wondering "Why do we ban drug taking?".
The argument for abandoning drugs testing is mostly that it doesn't seem to work. Think about Lance Armstrong, for example. He was doping for a number of years without being found out.
What's the advantage of banning drugs? I'm not sure that there is one. You might say that "drugs are against the spirit of sport", but you could also say that about professionalism in sport. Or even about practicing before the event. Or what about paying for a coach? Or what about streamlining bicycles?
The strongest argument about using drugs that I've heard, is that they carry health risks. But so does tobacco, and we haven't banned that. And what about the problems that football causes to knees? Or boxing to heads? Or American fottball with its repeated concussions? Or climbing Everest? Surely we can leave it to adults to decide for themselves whether to take the risk or not?
Here's an interesting list of pros and cons.