Kurt Britz checks a driver's license at the 3-D Denver Discrete Dispensary on Jan. 1, 2014, the first day recreational marijuana sales were legal in Colorado. Possession remains illegal for those under 21 years old, and statistics show a widening racial gap in arrests for those offenses. Theo Stroomer/Getty Images hide caption

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As Adults Legally Smoke Pot In Colorado, More Minority Kids Arrested For It

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More Washington Drivers Use Pot And Drive; Effect On Safety Disputed

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Leaders of the Alaska Cannabis Club share a joint at their medical marijuana dispensary in Anchorage. On Tuesday, Alaska became the third state in the nation to legalize recreational marijuana use. Mark Thiessen/AP hide caption

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Mark Thiessen/AP

Customers browse the pot products at Cannabis City in Seattle. In Washington, the 2012 initiative to legalize pot was sold as a way to decrease expenses for local governments. Elaine Thompson/AP hide caption

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Elaine Thompson/AP

Cities Argue For a Bigger Share Of Pot Tax Revenue

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Deuel County Sheriff Adam Hayward shows off a container of confiscated marijuana in Chappell, Neb., in July. Nikki Kahn/The Washington Post/Getty Images hide caption

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Nebraska Says Colorado Pot Isn't Staying Across The Border

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Officials in Aspen have put out a brochure on how to use marijuana safely and legally. Marci Krivonen hide caption

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Marci Krivonen

Getting High Safely: Aspen Launches Marijuana Education Campaign

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Nebraska and Oklahoma say Colorado's marijuana law is unconstitutional, in a challenge to the law in the Supreme Court. Earlier this month, visitors from Texas smell marijuana at the Breckenridge Cannabis Club. Brennan Linsley/AP hide caption

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Brennan Linsley/AP

Trimmers prepare the marijuana flower, or bud, to make it more appealing to consumers. They use scissors to snip off the leaves and stems. Brett Myers/Youth Radio hide caption

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Brett Myers/Youth Radio

With Harvest Season, 'Trimmigrants' Flock To California's Pot Capital

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Brooke Gehring, CEO of Patients Choice and Live Green Cannabis, stands in one of her company's grow houses in Denver. Kirk Siegler/NPR hide caption

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Kirk Siegler/NPR

Colorado's Pot Industry Looks To Move Past Stereotypes

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Early results showed more than a 2-1 lead for a measure to make recreational marijuana use legal in Washington, D.C. A sign promoting the initiative is seen on a corner in the Adams Morgan neighborhood Tuesday. Allison Shelley/Getty Images hide caption

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Workplace drug testing for marijuana may need updating in light of changing laws, a case before the Colorado Supreme Court suggests. Kai-Huei Yau/MCT/Landov hide caption

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Kai-Huei Yau/MCT/Landov

Colorado Case Puts Workplace Drug Policies To The Test

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Outside New York City Hall, a policeman watches a protest against racial disparities in marijuana arrests. The majority of those arrested are black or Latino, even though those groups are not more likely to smoke pot. Andrew Burton/Getty Images hide caption

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Brooklyn DA Shifts Stance On Pot, But That Won't Impact NYPD

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