How does Fentanyl appear on a mouth swab test?

Fentanyl can be detected on a mouth swab test as it is a potent synthetic opioid that may be present in saliva shortly after use. The test typically screens for the presence of fentanyl metabolites or the drug itself. Depending on the sensitivity of the test, it can show positive results even at low concentrations. The window for detection in saliva is generally shorter compared to urine tests, often within a few hours to a couple of days after consumption.