TN Scientific (FYL) Forensic Test Kit is a lateral flow chromatographic immunoassay for the qualitative detection of Fentanyl in liquid and powder substances at the cut-off concentration of 20 ng/mL. It is specific for Fentanyl screening with no significant cross-reactivity to other opiates, such as Morphine and Heroin. TN Scientific (FYL) Forensic Test Kit is able to detect Fentanyl and many other Fentanyl analogs such as Carfentanil, Acetylfentanyl, Ocfentanil, Remifentanil, Sufentanil, Valerylfentanyl, Crotonylfentanyl, Butyrfentanyl, Acrylfentanyl, and many more. Interpretation of test results are: positive (one line), negative (two lines), invalid (no lines or no control line). TN Scientific (FYL) Forensic Test Kit contains Fentanyl test strips and instructions.