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"There's a general public zeitgeist that marijuana is a pretty safe drug," said study co-author Darin Erickson, an associate professor at the University of Minnesota's School of Public Health.
"In actuality, there hasn't been a lot of research regarding how marijuana is used, its safety or its harms," he added in a university news release.
For the study, Erickson and his team surveyed 50 local enforcement agencies in Colorado and Washington state in 2016 and 2017 to find out if underage marijuana use (under 21) and marijuana-impaired driving are problems in their cities. In addition, the researchers asked about the types of enforcement used to tackle those problems, and the resources available to do so.
All of the agencies said that underage use is somewhat or very common, and most said that marijuana-impaired driving is somewhat or very common.
Thirty percent said they conducted enforcement targeting underage use or possession or marijuana, and 20 percent said they conducted underage compliance checks at licensed stores, with a higher rate in Colorado (32 percent) than Washington (8 percent), the findings showed.
One local enforcement agency in each state specifically targeted marijuana-impaired driving, according to the study published recently in the International Journal of Drug Policy.
"In general, we found that enforcement is not a high priority for most places," Erickson noted.
"That said, we know enforcement strategies work to curb illegal substance use. Enforcing alcohol laws reduces underage drinking and related problems -- and it could be used to improve the situation with marijuana," Erickson said.
Solutions recommended by Erickson include states using tax money from retail marijuana sales to fund policy enforcement programs.
Other suggestions include conducting further research to develop roadside tests for marijuana-impaired driving, as well as studies to learn how people typically use marijuana, such as in conjunction with alcohol.
-- Robert Preidt
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SOURCE: University of Minnesota, news release, Jan. 31, 2019