And it's hard to conduct research on marijuana right now. The report says that's largely because of regulatory barriers, including marijuana's Schedule I classification by the Drug Enforcement Administration and the fact that researchers often can't access the same sorts of marijuana that people actually use. Even in states where it's legal to buy marijuana, federal regulations prevent researchers from using that same product.
Without the research, it's hard to say how policymakers should best support legalization efforts — to say how educational programs or mental health institutions should adapt to support any changes, for example.
"If I had one wish, it would be that the policymakers really sat down with scientists and mental health practitioners" as they enact any of these new policies, Krista Lisdahl, an associate professor of psychology and director of the Brain Imaging and Neuropsychology Lab at the University of Wisconsin at Milwaukee, told Business Insider in an interview shortly before we could review this report.
It's important to know what works, what doesn't, and what needs to be studied more. This report does a lot to show what we've learned in recent years, but it also shows just how much more we need to learn.
In studying cannabis, "we're not really after the good or the bad — we're after the truth," Gruber said.
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