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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.

How it works: Scientists assign participants particular commercial marijuana products with already-known chemical makeup and potency, which the subjects go out and purchase for themselves. The researchers go to the participants' homes and first perform tests while they are sober. They then measure the effects of the drug after it is smoked, eaten, vaped, etc. But the researchers never see the commercial product itself.

Precision: While the studies are not as precise as a normal lab study, they are as good as it gets given the legal restrictions on researchers.

Go deeper: WIRED's full piece and Sessions hints at federal crackdown on marijuana

Go deeper

Dave Lawler, author of World
37 mins ago - World

Venezuela's predictable elections herald an uncertain future

The watchful eyes of Hugo Chávez on an election poster in Caracas. Photo: Cristian Hernandez/AFP via Getty

Venezuelans will go to the polls on Sunday, Nicolás Maduro will complete his takeover of the last opposition-held body, and much of the world will refuse to recognize the results.

The big picture: The U.S. and dozens of other countries have backed an opposition boycott of the National Assembly elections on the grounds that — given Maduro's tactics (like tying jobs and welfare benefits to voting), track record, and control of the National Electoral Council — they will be neither free nor fair.

Biden plans to ask public to wear masks for first 100 days in office

Joe Biden. Photo: Mark Makela/Gettu Images

President-elect Joe Biden told CNN on Thursday that he plans to ask the American public to wear face masks for the first 100 days of his presidency.

The big picture: Biden also stated he has asked NIAID director Anthony Fauci to stay on in his current role, serve as a chief medical adviser and be part of his COVID-19 response team when he takes office early next year.