“It [second hand marijuana smoke] would not register on our tests. We had a test where someone was placed in a isolated room with THC smoke was being pumped in for 24 hours straight and the person did not register. On a lab test it did pick up about 3 or 4 nanograms but as you know instant tests are set at 50ng/ml.”

Even at the confirmatory GC/MS lab urine drug test level of 15 ng/ml, you would still not test positive for marijuana due to second hand smoke.