Thats right. Because of the hefty costs of the GC/MS, Only the drug panel(s) that have tested non-negative on the initial assay screen will undergo the confirmation GC/MS.

And if youre worried about the GC/MS because of its lower (numerically) cutoff threshold, dont be. Even though their cutoff thresholds numerically differ, a 50 ng assay screen is functionally equivalent to the 15 ng GC/MS. For more info, read post #7 of this thread:
http://boards.cannabis.com/drug-test...d-testing.html
Burnt Toast Reviewed by Burnt Toast on . Urinalysis (THC) Facts A friend recently had a drug test and asked me to help them get some info - I'm better at googling. I found some good source material that people can use to give themselves a realistic estimate on when they will be able to naturally pass a piss test (UA). If you don't know what your next step is hopefully this information will be helpful. First a few basic things: -The most common pre-employment screen is a 50 ng/mL immunoassay (I/A), basically a dipstick-like test, if non-negative it's Rating: 5