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A 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?
A doctor has provided 1 answer
12 to 24 hours: Marijuana swab test can test marijuana if the person has used 12 to 24 hours prior not longer than that.
Answered 7/3/2017
5.3k views
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