This is not a professional opinion, but I don't think long at all. My friend said smoked a blunt in the morning, rinsed his mouth out with Listerine, and then passed a swab test later on in the day.
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THC, the active ingredient in marijuana, can typically be detected in a swab test for up to 1-3 days after use. However, this can vary depending on factors such as frequency of use, dosage, and individual metabolism.
Marijuana can typically be detected in a saliva swab test for up to 72 hours after use. However, individual factors such as metabolism and frequency of use can impact detection times.
A swab test can detect marijuana in saliva for up to 24-48 hours after use. The detection window can vary depending on factors such as frequency of use and individual metabolism.
A mouth swab is the lesser used version of a drug test, as it is only applicable up to 48-72 hours after usage. In other words, if you smoke a joint on friday, you'll pass a drug test via mouth swab come Monday.
A swab test can typically detect marijuana use within the past 12-24 hours. The detection window may vary based on individual metabolism and frequency of use.
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.