As a scientist who followed the case closely, I came to my own conclusions.
I think the problem is that while USADA can subpoena witnesses, the defendant athletes can’t necessarily depose and cross-examine these same witnesses. They are not allowed the same access to them that USADA has. Thus an example that keeps coming up is that USADA could take a statement from a witness, then not make that witness available in court.
But consider another scenario:
Suppose I am a close friend of an elite athlete, he spends a lot of time over at my house. I can imagine WADA could justify coming to my house and doing a thorough search, on the grounds that I might be hiding PEDS or associated paraphernalia. Now if this were a criminal I was consorting with, the law would at least have to get a search warrant from a judge to allow this. But if I understand the situation, WADA doesn’t need this kind of order to search an athlete’s house, because the athlete, in signing with some national fed, has waived this particular constitutional right. And if I understand this article correctly, WADA could use the same rationale to search my house. Certainly WADA doesn’t need a search warrant to come over to my house if the athlete is there and they want to test him, and while they are there, what’s to stop them from poking around?
That is what I find a little scary. And it gets worse. Maybe they find no PEDs, nothing relevant to doping or my friend, but find something else that incriminates me in some completely different legal situation. They have obtained this evidence by means that would ordinarily not be allowed. But it seems that they might be allowed from a WADA search.
If I have misinterpreted/exaggerated the situation, someone call me on it. But even if I have, I think it’s fair to say that this is a very plausible future scenario.