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Table 2 Differing reactivity of BTNX (blue) and DanceSafe (yellow with black “FEN”) FTS in street drug samples spiked with fentanyl analogs

From: Assessment of two brands of fentanyl test strips with 251 synthetic opioids reveals “blind spots” in detection capabilities

Spiked compound

Standard solution

Cocaine

Heroin

DS

BTNX

FTS images

DS

BTNX

FTS images

DS

BTNX

Water

neg

neg

View full size image

neg

neg

View full size image

neg

neg

Fentanyl

pos

pos

View full size image

pos

pos

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pos

pos

Tetrahydrofuran fentanyl

neg

pos

View full size image

neg

pos

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neg

pos

α′-methoxy fentanyl

neg

pos

View full size image

neg

pos

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neg

pos

N-(2C-D) fentanyl

pos

neg

View full size image

pos

neg

View full size image

pos

neg*

N-(2C-G) fentanyl

pos

neg

View full size image

pos

neg

View full size image

pos

neg*

N-(3,4,5-TMA) fentanyl

pos

neg

pos

neg

pos

neg

  1. Two results denoted by neg* were rated as weak negatives by the reader