Yes, exactly. Quite a few possibilities are being tested, as in they exist (maybe). It is quite literally being blocked by regulatory approval, with the testing for validity and safety being the approval process.
Nope. They're being tested for validity, meaning that their existence _as a treatment_ is under test. If it turns out they don't have an effect, will you say "we did have a cure for a moment: leeches; but it was rejected by the regulatory process, therefore bad bureaucrats for showing that it didn't work"?
Of course not, that doesn't make sense...if your goal is a cure. (If you're peddling hope, or just looking to make money off quack medicine, OTOH...)
