January 18, 2023
Xylazine test strips can reliably produce presumptive results of the presence of xylazine in drug samples. The test strips produced true positives for all the authentic drug samples containing xylazine and produced true negatives for all samples without xylazine. Sampling residue or a small amount of powdered material and diluting in 1 mL of water was sufficient sample preparation to produce solutions with a concentration above the LOD of the test strips.