U.S. doctors online nowAsk doctors free
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 answer2 doctors weighed in
Dr. Mohammed Younus
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.
Created for people with ongoing healthcare needs but benefits everyone.

Related questions

A 20-year-old female asked:
I may have accidentally ingested marijuana through a brownie. How long will the dry mouth last?
1 doctor answer2 doctors weighed in
A 34-year-old male asked about a member:
How long can 1 use of marijuana be detected on a saliva drug test ?
2 doctor answers8 doctors weighed in
A 19-year-old male asked:
How long will marijuana stay in your saliva for a saliva test if you are a heavy user?
2 doctor answers2 doctors weighed in
Last updated Jul 3, 2017


Content on HealthTap (including answers) should not be used for medical advice, diagnosis, or treatment, and interactions on HealthTap do not create a doctor-patient relationship. Never disregard or delay professional medical advice in person because of anything on HealthTap. Call your doctor or 911 if you think you may have a medical emergency.