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. Author manuscript; available in PMC: 2021 Mar 1.
Published in final edited form as: Drug Alcohol Depend. 2020 Jan 7;208:107779. doi: 10.1016/j.drugalcdep.2019.107779

Fig. 3.

Fig. 3.

Annual fractions of positive BCI lab tests from major drug classes that contain the specified drug class. The fraction of tests is calculated as the number of drug-specific tests divided by the sum of all positive tests that can contain at least one of the major drug classes (that is fentanyl, carfentanil, other fentanyl analogs, heroin, cocaine, benzodiazepines, synthetic cannibinoids, methamphetamine/amphetamines, other synthetic stimulants (mostly cathinones), MDMA, psychedelics, and other designer drugs. Samples can test positive for multiple substances. Synthetic opioids includes fentanyl and analogs as well as other illicit synthetic opioids such as U47700. Data Source: BCI Crime Lab Data, 2018 data is preliminary.