Most home tests carry the same cutoff limit as the DOT test (50 ng for the initial screening).

Even though their cutoffs numerically differ, a 50 ng assay screen is functionally equivalent to the 15 ng GC/MS. To find out how and why, hit the Forum Search button, using the terms "functionally equivalent metabolites".

A faint line is still a negative. Even if an untrained tech were to misinterpret a faint line as a "non-negative", and sent the sample off for confirmation, the sample would still come back as a negative.
Burnt Toast Reviewed by Burnt Toast on . DOT Drug testing I have a drug test today for pre-employment. It's being done by Quest Labs. I took a marijuana only drug test this morning when I first woke up, and the line was there but faint. I'm sure I'll pass, but is there a difference with DOT and regular that they will consider a faint line positive or otherwise require further testing? I'm drinking Gatorade all day today and will be waiting a few hours before I go in today to take it. I should be good. I'm 6'7" and really heavy, like 350 (mostly Rating: 5