[discostu]

It’s actually pretty typical. The dopers generally run ahead of the agencies. The agencies always have to deal with 2 problems: first figuring out if said substance actually does enhance performance (the number of rumored enhancers is much higher than the number that actually do something), then they have to figure out how to detect it in blood and urine samples (no point in banning something you can’t detect).

[Ransomed]

Well, you can still punish people if you catch them doing it by other means than sampling their body fluids. Seems like even if their is no test for some PED the PED could still be banned.

Freegards

[RayChuang88]

Actually, what REALLY scares the daylights out of USADA and WADA is the development of PED's based on each athlete's own stem cells--which effectively makes them just about impossible to detect since with such a high level of PED customization, there is no standard just to find their use. For example, we could get stem cell-based PED's that could make it look exactly like the testosterone level was "naturally" raised, but was actually done by customized doping compound.

At that point, drug testing is essentially useless unless the athlete was using an older chemical PED that is easily detected nowadays.