Officials in Aspen have put out a brochure on how to use marijuana safely and legally. Marci Krivonen hide caption
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Friday
Thursday
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
Tuesday
Volunteers with the DC Cannabis Campaign (left and center) talk to a voter on Election Day about the ballot initiative to legalize marijuana. The measure was approved, but its fate remains uncertain. Allison Shelley/Getty Images hide caption
Thursday
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
With Harvest Season, 'Trimmigrants' Flock To California's Pot Capital
Monday
Nabor, a small-scale marijuana grower in the northwestern Mexican state of Sinoloa, checks his plants. As legal pot increasingly becomes available in the U.S., Americans appear to be buying more that is grown domestically. Prices for marijuana from Mexico have fallen sharply. John Burnett/NPR hide caption
Legal Pot In The U.S. May Be Undercutting Mexican Marijuana
Tuesday
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
Thursday
Low-dose pot-infused cookies, called the Rookie Cookie, sit on the packaging table Sept. 26 at The Growing Kitchen in Boulder, Colo. The state legalized recreational pot use last year. Brennan Linsley/AP hide caption
Wednesday
This human-scale lab rat cage is parked near a skate park in Denver, Colo., to make a point about the lack of science on marijuana. Richard Feldman Studio/Sukle Advertising and Design hide caption
Wednesday
Does smoking pot make it less likely that you'll go to college? iStockphoto hide caption
Tuesday
Edibles available at LoDo Wellness Center, a retail marijuana and medical marijuana dispensary and grow facility in downtown Denver. Matthew Staver/Landov hide caption
Tuesday
A smoker takes a puff at the annual Global Marijuana March in Copenhagen in May 2013. Gonzales Photo/Demotix/Corbis hide caption
Monday
Amber McGowan, left, and Krystal Klacsan work Monday at Cannabis City in Seattle, a day before the store is to begin legal pot sales on Tuesday. The store will be for now the only one in Seattle to sell recreational marijuana. Ted S. Warren/AP hide caption
Tuesday
The overwhelming majority of people think there should be age restrictions on the recreational use of marijuana. Ben Nelms/Reuters/Corbis hide caption
Sunday
People smoke marijuana, presumably, because it affects their brains, not despite that fact. Above, people in Sao Paulo, Brazil, campaign for the legalization of marijuana. Nelson Almeida/AFP/Getty Images hide caption
Thursday
Former Supreme Court Associate Justice John Paul Stevens likens making pot illegal to Prohibition. In his new book, Six Amendments, he proposes constitutional changes including a curb on an individual's right to bear arms. Chip Somodevilla/Getty Images hide caption