A new study found that police in British Columbia were far more likely to document alcohol involvement in a crash than the involvement of cannabis, other recreational drugs, or potentially impairing medications. The study’s authors suggest this raises doubts both about the police’s ability to enforce drug-impaired driving laws as well as public health officials’ documentation of drug-impaired driving.
As more states legalize recreational use of marijuana, decision makers are seeking to understand the implications for safety and public policy. A number of recent studies have examined whether states that have legalized marijuana are seeing higher incidence of car crashes and road fatalities, with differing results. While some studies have found that marijuana use could double crash risk according to the Insurance Institute for Highway Safety, others have found no link between legalization of the drug and crashes.