Check the listing for details. Fentanyl Home Drug Testing Strips (Urine/Powder) High Accuracy (5pk). Condition: New. Listed at 14.99 USD. Fentanyl Home Drug Testing Strips (Urine/Powder) High Accuracy (5 pack) These BTNX Rapid Response Fentanyl Test Strips are the only test strips recommended by a 2018 John Hopkins University Study. These Fentanyl test strips come individually packaged for your convenience and safety. Can detect Fentanyl and many other Fentanyl analogues such as Carfentanil, Acetyl Fentanyl, Butyryl Fentanyl, Remifentanil, Ocfentanil, Sufentanil, p-Fluoro Fentanyl, Furanyl Fentanyl, Valeryl Fentanyl, and 3-Methyl Fentanyl Greater than 98% accuracy, Time to result: 5 minutes Just add 1 oz of water to substance in question, insert strip, leave in horizontal position for 5 minutes.Fentanyl Home Drug Testing Strips (Urine/Powder) High Accuracy (5 pack) These BTNX Rapid Response Fentanyl Test Strips are the only test strips recommended by a 2018 John Hopkins University Study. These Fentanyl test strips come individually packaged for your convenience and safety. Can detect Fentanyl and many other Fentanyl analogues such as Carfentanil, Acetyl Fentanyl, Butyryl Fentanyl, Remifentanil, Ocfentanil, Sufentanil, p-Fluoro Fentanyl, Furanyl Fentanyl, Valeryl Fentanyl, and 3-Methyl Fentanyl Greater than 98% accuracy, Time to result: 5 minutes Just add 1 oz of water to substance in question, insert strip, leave in horizontal position for 5 minutes.