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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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7mo 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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