I would appreciate some clarity on this whole line thing. The cutoffs for these test are 50/ngs (I believe...). The tests say that if ANY type of line shows up, that means the result is a negative. This obviously means that your either really close or below the cutoff....My main concern is that how do these labs view this. I am under the impression that most places will not use the GC/MS method unless the first test comes back as positive. If this border line result comes up in a lab, does they push the envelope or take it as a passing grade?