NIK Special Fentanyl Test Packs. NIK recommends a testing sequence for the presumptive detection of Fentanyl. The use of multiple tests helps eliminates the chance of erroneous presumptive identification of an unknown substance. Kit contains NIK tests A B I K and W to complete the testing sequence. A box of neutralizer is also included. When testing unknown white powders officer safety is of the utmost importance. Package Contents: NIK Special Fentanyl Test Pack NIK 1224044: Special Fentanyl Test Packs