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How Colorado scientists study weed

Photo: Michel Porro / Getty

Recreational marijuana has been legal in Colorado since 2014, but researchers hoping to study the effects of the drug on humans are restricted by federal law to government-grown marijuana, which is significantly weaker and less diverse than commercial weed.

A group of researchers from the University of Colorado Boulder created a loophole by buying a van — the CannaVan — and are traveling around the state to study the physical and mental effects of government-grown marijuana versus commercial marijuana products for sale at local dispensaries, according to WIRED.