A simple and affordable dipstick test is the Rapid ResponseTM Fentanyl Test Strip (Liquid/Powder). At cut-off levels greater than 200 ng/mL, it is a quick and accurate qualitative screening test for fentanyl. In as little as one minute, this drug test can deliver precise and prompt findings. Only for forensic purposes. Not an IVD. F or more information about Lochness Medical - fentanyl test visit https://www.lochnessmedical.com/Product/fentanyl-test-strips-10-pack