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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Nikki Kahn/The Washington Post/Getty Images

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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C. Nash smokes after possession of marijuana became legal in Washington state on Dec. 6, 2012. Ted S. Warren/AP hide caption

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Ted S. Warren/AP

Evidence On Marijuana's Health Effects Is Hazy At Best

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The teenage years are the last golden opportunity to build a healthy brain, researchers say. So smoking pot might not be so smart. Tomas Rodriguez/Corbis hide caption

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Tomas Rodriguez/Corbis

Marijuana May Hurt The Developing Teen Brain

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The legalization of marijuana could dry up a revenue stream for police, according to reports. Here, two men share a water pipe underneath the Space Needle shortly after a law legalizing the recreational use of marijuana took effect in Seattle in 2012. Stephen Brashear/Getty Images hide caption

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A man uses the Nasal Ranger to detect smells in the southern U.S., in this photo provided by St. Croix Sensory. In Denver, the device is being used to monitor complaints of strong marijuana smells. Courtesy of Nasal Ranger hide caption

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Courtesy of Nasal Ranger

An ATM sits next to a rack of marijuana clone plants that are used to grow medical marijuana on Wednesday at The Joint, a medical marijuana cooperative in Seattle. Last week Washington became the second U.S. state to adopt rules for the recreational sale of marijuana. Ted S. Warren/AP hide caption

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Ted S. Warren/AP