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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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Does A Mouth Swab Test Detect Drugs After Smoking Up?

I smoked last Sunday night and I did a mouth swab for a job Thursday evening do you think I will be okay. That Thursday. morning before I left for my interview I brush my teeth and washed my mouth out with mouth wash twice. Do you think I passed are should I be worried?
posted on Tue, 27 Oct 2015
Twitter Mon, 9 Nov 2015 Answered on
Twitter Mon, 9 Nov 2015 Last reviewed on
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Addiction Medicine Specialist,  's  Response
tricky. The mouth swabs are a bit less sensitive than urine. Drugs generally are detectable up to 5 days in urine, mouth swabs ... more like 4. BUT, marijuana is quite variable. If someone were a constant heavy smoker it certainly would be more than a week detectable. On one use, it is just hard to predict. Generally, it's negative a day later.
http://www.ncbi.nlm.nih.gov/pubmed/19155965
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Does A Mouth Swab Test Detect Drugs After Smoking Up?

tricky. The mouth swabs are a bit less sensitive than urine. Drugs generally are detectable up to 5 days in urine, mouth swabs ... more like 4. BUT, marijuana is quite variable. If someone were a constant heavy smoker it certainly would be more than a week detectable. On one use, it is just hard to predict. Generally, it s negative a day later. http://www.ncbi.nlm.nih.gov/pubmed/19155965