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

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

Spiked compound	Standard solution		Cocaine			Heroin
Spiked compound	DS	BTNX	FTS images	DS	BTNX	FTS images	DS	BTNX
Water	neg	neg		neg	neg		neg	neg
Fentanyl	pos	pos		pos	pos		pos	pos
Tetrahydrofuran fentanyl	neg	pos		neg	pos		neg	pos
α′-methoxy fentanyl	neg	pos		neg	pos		neg	pos
N-(2C-D) fentanyl	pos	neg		pos	neg		pos	neg*
N-(2C-G) fentanyl	pos	neg		pos	neg		pos	neg*
N-(3,4,5-TMA) fentanyl	pos	neg		pos	neg		pos	neg

ISSN: 1477-7517