Analysis of Drug Test Results Before and After the US Declaration of a National Emergency Concerning the COVID-19 Outbreak.

This substance use epidemiology study uses a commercial urine drug testing (UDT) service’s data to compare UDT results for cocaine, fentanyl, heroin, and methamphetamine before vs after US declaration of coronavirus disease 2019 (COVID-19) as a national emergency among patients diagnosed with or at risk of substance use disorders.