President Barack Obama celebrates with lawmakers after signing into law the Patient Protection and Affordable Care Act health insurance bill in March 2010. Jewel Samad/AFP via Getty Images hide caption
legalization of marijuana legalization of marijuana
Stories About
legalization of marijuana
University of Pittsburgh researchers developed a prototype device that can measure the amount of THC in a person's breath. Courtesy of the University of Pittsburgh hide caption
Scientists Unveil Weed Breathalyzer, Launching Debate Over Next Steps
Customers buy products at the Harvest Medical Marijuana Dispensary in San Francisco in 2016. Illinois has joined California and nine other states in legalizing the recreational use of the drug. Haven Daley/AP hide caption
Marijuana plants are grown for medicinal purposes in a clandestine greenhouse in Mexico City in 2015. Mexico legalized medical marijuana in 2017, but recreational pot remains largely illegal. Yuri Cortez/AFP/Getty Images hide caption
"Budtender" Marissa Dodd bags up a marijuana sale at the Dr. Reefer marijuana dispensary across from the University of Colorado in Boulder, Colo. Chris Hondros/Getty Images hide caption
Congress marijuana Bill Clark/CQ-Roll Call,Inc. via Getty Images hide caption
Flowering medicinal marijuana plants in 2016 at Tweed INC in Smith Falls, Ontario. Lars Hagberg/AFP/Getty Images hide caption
Adam Eidinger (at right, in hat), a leader of DC Cannabis Coalition, and other volunteers roll marijuana joints they plan to hand out for free on Inauguration Day. Pam Fessler/NPR hide caption
From Glitter To Free Joints, Trump Protesters Plan To Get Their Message Out
The highly rated variety of medical marijuana known as "Blue Dream" was displayed among other strains at a cannabis farmers market in Los Angeles in 2014. Frederic J. Brown/AFP/Getty Images hide caption
Krystal Xiques smokes marijuana at a rally in support of Prop 64 at Sparc Dispensary in San Francisco on Tuesday. Marcio Jose Sanchez/AP hide caption
Marijuana grows in the home of two medical marijuana patients in Medford, Ore. Jeff Barnard/AP hide caption
How The 'Cannabis Catch-22' Keeps Marijuana Classified As A Harmful Drug
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
As Adults Legally Smoke Pot In Colorado, More Minority Kids Arrested For It
The psychoactive ingredient in marijuana is a fat-soluble compound called THC. iStockphoto hide caption
More Washington Drivers Use Pot And Drive; Effect On Safety Disputed
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
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
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
Officials in Aspen have put out a brochure on how to use marijuana safely and legally. Marci Krivonen hide caption
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
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
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
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