This may be way off base, but a few years ago there was a home saliva
test you could do for about 40 dollars. I did it and it matched within 200ng/ml with my blood
test. I think you want to know if it's good before you take a chance with it, right? I would do a search on the web for the saliva
test, it may have been from AST's web site, not sure. Anyhow, get the spit
test and draw a bit of gear out and dab the swab in your mouth first, then put a tiny bit of gear on the swab and send it in. I bet if your gear is lagit you will hold the record for the spit testers, and if it shows nothing it's probably bad, but, like I said I could be way off base.