BTNX Fentanyl Testing Strips are an effective way to test powders and liquids for the presence of fentanyl. According to a 2018 John Hopkins University Study, BTNX test strips were able to identify analogues of fentanyl with 98% accuracy. 

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DISCLAIMER: THE ONLY WAY TO MAINTAIN ACCURACY IS TO TEST THE ENTIRE SUBSTANCE TO BE CONSUMED. TESTING A SAMPLE IS JUST THAT - TESTING A SAMPLE.  FENTANYL COULD BE UNEVENLY DISTRIBUTED SO THIS IS THE ONLY WAY TO GET A RELIABLE RESULT