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Usually 12 hours. But in some cases up to 78 hours if you're not healthy enough to produce new cells quickly.

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Q: How long can a mouth swab drug test detect marijuana?
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Related questions

How long will it take to pass a mouth swab drug test for marijuana?

48 to 72 hours should do it. Marijuana exits the fat cells within your mouth in 72 hours.


How long before you can't detect marijuana in an eye exam?

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No drugs will be visible on a mouth swab after 3-4 days. Your mouth is constantly recycling cells. Even long term drugs like marijuana will be undetectable in saliva after a few days. If you are concerned about a drug test I would give it a full 5-6 days just for peace of mind.


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