Can someone taking morphine sulfate test positive for fentanyl in a saliva drug test, although they have never taken fentanyl ever?

Yes, Both drugs in the same class (opioids) so they will both show up the same. Fentanyl is a synthetic opioid and much stronger than morphine. When testing for Morphine, it will show positive for morphine metabolites or fentanyl. Take care.

Related Questions