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Dale Said:

Can I test positive from second hand smoke?

We Answered:

Most drug tests are not done by hair follicle. To expensive and even though hair goes back about 3 months blonds and Blacks tend to have false positives.
No shampoo helps with hair tests.
Urine is most used, blood is best.

Anyway the answer is yes. For cannabis a decent amount of second hand smoke can trigger a positive urine test for up to a month after exposure. The second hand smoke is cumulative, if you continuously and regularly are exposed it builds up to a level that shows positives on the test.

Back in the late 80's I was assigned to 3 days of Grateful Dead concerts. Two weeks after on a random test I showed positive for cannabis. All I did was breath normally.

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