What are the odds of a false positive in these tests? We are never told this.
Part of the problem is that if you dope properly, you should never be caught. Those that get caught are usually caught for errors or stupidity in their doping. So you have this drug that heps you and should be undetectable if you follow its prescription. 299 times out of 300 it helps you survive as a pro, or win races. But occasionally you are stupid and get caught. Then you get your life handed to you.
I'm not apologizing for dopers. Just explaining the system that makes it so easy to decide to dope, then traps them in rare circumstances. But what is the chance of a false positive? The authorities would like us to believe it is zero. But it can't be zero.