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smokez4u2 Reviewed by smokez4u2 on . Does Positive for other substance trigger GC/MS for all? Does Positive for other substance trigger GC/MS for all? Person takes amphetamine legally (i.e., can provide a legal script). Person smokes but at the moment has a theoretical cutoff of THC at 20 ng/mL. Person passes for substances except amphetamine. Sample is sent to the lab for confirmation (which we will assume can detect to 15 ng/mL THC). Does person now fail for THC? I have run GC/MS myself and cant imagine why they would not. The peak is going to show up regardless unless Rating: 5