Although Fentanyl is a Synthetic Opiate, the Sweat Patch Extended Opiate Panel does not detect it’s use. The Sweat Patch with extended opiate panel tests for the 5 most common drugs of abuse (marijuana or THC, cocaine, opiates, amphetamines/methamphetamines and PCP). The extended opiate panel tests for Hydrocodone, Hydromorphone, Oxycodone, and Oxymorphone. The patch is water-resistant and stays on through showers and swimming.