Hundreds of advocates for marijuana legalization rally and smoke pot outside the White House in Washington, D.C. on April 02, 2016. The Washington Post/The Washington Post/Getty Images hide caption

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A budtender prepares an edible sale for a customer at LivWell Broadway in Denver. Craig F. Walker/Denver Post via Getty Images hide caption

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Alaska legalized pot this year and is the first state to have pot cafes where people can consume marijuana. Mark Thiessen/AP hide caption

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Alaska's Pot Cafes Will Give Patrons A Taste Of Cannabis

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This second-generation prototype of a marijuana field tester being developed at Washington State University is larger than the planned final product. Tom Banse/KUOW hide caption

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High On The Highway: Scientists Try To Build A Marijuana Breath Test

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A strain of high-cannabidiol marijuana is used to create extracts used in experimental epilepsy treatments. GW Pharmaceuticals hide caption

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Marijuana Extract May Help Some Children With Epilepsy, Study Finds

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Customers browse samples at Shango Cannabis shop, after the first day of legal recreational marijuana sales began at midnight in Portland, Ore., Thursday. Steve DiPaoloa/Reuters /Landov hide caption

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Partygoers attend a Prohibition-era themed New Year's Eve party celebrating the start of retail pot sales, at a bar in Denver on Dec. 31, 2013. Brennan Linsley/AP hide caption

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Awesome Tips, Dude: Denver May Allow Pot In Bars, Restaurants

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Hard to resist. But if they're marijuana edibles, not such a treat. James A. Guilliam/Getty Images hide caption

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When Pets Do Pot: A High That's Not So Mighty

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