Q. Will drug test be positive with just inhaling marijuana smoked by someone?

Answered by
Dr. Arul Amuthan
and medically reviewed by iCliniq medical review team.
This is a premium question & answer published on Aug 13, 2018

Hi doctor,

When crossing a bar, I come across people smoking marijuana. Would a person test will be positive on hair or urine drug test in any situation? I am not a drug user.



Welcome to icliniq.com.

While crossing a bar, when someone smokes marijuana (Cannabis) out, there is a possibility of inhalation through the nose. Chronic exposure occurs for people who work in the bar. Sufficient amount can enter into the lung and blood, which can be tested in hair or blood. So, just crossing the marijuana smoke never makes the hair to accumulate marijuana or to make positive. There is a small chance for deposition of smoke on the hair. But, it would go off if washed while bathing.

If the hair sample is collected after the exposure of smoke without a bath, then there is a chance for the test to be positive in the hair. If the sufficient amount of smoke enters into the lungs, definitely it goes to blood. Once it reaches the blood, it needs to get excreted through urine. Hence, within 12 hours of smoke exposure, the urine may show a positive result.

For more information consult a toxicologist online --> https://www.icliniq.com/ask-a-doctor-online/toxicologist

Thank you doctor,

I just pass through the bar only once, and I am not working there. When inhaling marijuana for an extended period, there will be drug detected in hair or urine?



Welcome back to icliniq.com.

No laboratory test will show drug positive if the smoke exposure is only once and if, the hair is washed before collecting it to the test.

For more information consult a toxicologist online --> https://www.icliniq.com/ask-a-doctor-online/toxicologist

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