A 47-year-old member asked:

I would like to test my son for marijuana use with a mouth swab test. how long do i have to test him after his last use?

1 doctor answer • 2 doctors weighed in

Dr. Mohammed Younusanswered

33 years experience

12 to 24 hours: Marijuana swab test can test marijuana if the person has used 12 to 24 hours prior not longer than that.

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Dr. Charlene Sojico

Dr. Charlene Sojico agrees1 doctor agrees

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Last updated Jul 3, 2017

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