How to use BTNX Fentanyl Strips 2022-09-29 19:07:38 +1000published this page in
What if my sample is negative for fentanyl?
If you used the strips correctly, the strip should be able to detect fentanyl and most of its known analogs (including carfentanil).
A negative result does not guarantee that your drug sample is free of all synthetic opioids.
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