Key points are not available for this paper at this time.
Fentanyl test strips successfully detected the majority of fentanyl analogues tested. Drug solutions for testing should not be overly dilute, since the test results are highly concentration dependent. Fentanyl test strips have utility as a harm reduction tool, but they are no panacea for overdose since certain fentanyl analogues are not detected.
Bergh et al. (Tue,) studied this question.