The big Questuon?

[Burnt Toast]

ok.. Duh?
Googled it
This is what I came up with?

Marijuana Metabolite 50 NG/ML 15 NG/ML

So they will be screening for 10 types of drugs with a 50 ng cutoff threshold for THC, which is the same cutoff as most home test kits. The confirmation GC/MS (15 ng) will only be performed on any of the 10 panels that have tested non-negative on the initial screen. If you test negative on the initial screen, the test is over right there as a "pass" - no confirmation GC/MS will be performed.