Fig. 2.

Expected and detected drug mixtures in provided samples. Note: Results based on the 109 participants who provided both survey data on expected drugs in their sample and a street drug sample that could be tested via LC–MS. The samples assessed here were restricted to those identified by participants as containing opioids. Intersection size reflects the total number of times a given combination was expected or detected, whereas set size reflects the total number of times a drug was expected or detected, regardless of in what combination with other drugs