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The only method of smoke inhallation with marijuana that will cause you to fail a urinalysis is first-hand consumption. If you sat in a room or a vehicle with someone who smokes, the concentration of tetrahydrocannabinol is not significant enough to show up on a urinalysis, blood or hair follicle test. Urinalysis being the cheapest of all the tests, shows positive at 50 nanograms of THC in the sample. Being around it will not cause a great enough concentration in your lungs to be absorbed into the bloodstream and passed out of the system as waste at a 50 nanogram level.

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16y ago

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