How research and policy can shape driving under the influence of cannabis.

The authors discuss the need for universal objective standards for DUIC, combined with consistent driving under the influence of cannabis (DUIC)-specific offenses and sanctions, to ensure highway safety. Topics include an increase in prevalence of DUIC and in fatal motor vehicle collisions in U.S. states and other countries following recreational cannabis legalization and challenges that underscore the complexities in developing clear, consistent and enforceable policies to limit DUIC.