That’s why testing isn’t the answer, you only can test for what you know about. Does doping occur? Absolutely! I know first hand it does. Surveillance is needed along with testing. They should treat the backstretch like Fort Knox. Random searches, limited entry , severe penalties for violations. How do you catch someone using Sgf - 1000, no test available, you have to watch them using it.
So while we chase around picograms, in urine and blood testing, only looking there, is not going to stop anything.