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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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11y ago
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6mo ago

A mouth swab drug test can detect marijuana use within the past 1 to 24 hours, depending on the sensitivity of the test. However, traces of marijuana can sometimes be detected in saliva for up to 72 hours after use in heavy or chronic users.

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Q: How long can a mouth swab drug test detect marijuana?
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Generally, marijuana can be detected in a mouth swab drug test up to 24-72 hours after use, but this can vary based on individual factors such as metabolism and frequency of use. Drinking plenty of water and practicing good oral hygiene may help reduce detection times.


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