Quote Originally Posted by Onezie
"At the 20 ng/mL cutoff concentration ... it would be uncommon for a chronic marijuana smoker to produce a positive urine drug test result longer than 21 days after the last smoking episode."
This is helpful, thanks. I am testing negative for the 50 ng/ml cutoff, but I am afraid they might run a GC/MS because I will be testing positive for a prescription medication I am taking. BurntToast seems to know their stuff and I read somewhere else in the forum that they would only do a GC/MS for whatever substance came up positive on the initial test, but I have seen conflicting info elsewhere and am paranoid.