The only way to tell if counterfeit pills are laced with fentanyl is to have them tested with fentanyl test strips.
The Centers for Disease Control and Prevention (CDC) warn that even though these strips can detect fentanyl, they may not be able to detect more potent fentanyl analogues like carfentanil.
Counterfeit pills are made to look like real prescription drugs, so it’s hard to tell that they aren’t authentic. The only way to know for sure that they’re safe is to get them from a registered pharmacy with a prescription.
Learn more about Fentanyl-Laced Prescription Drugs