Libertarian presidential candidate Gary Johnson talks to a crowd of supporters at an August rally in Salt Lake City. George Frey/Getty Images hide caption
marijuana
Friday
Saturday
Diego, a tortoise of the endangered Chelonoidis hoodensis subspecies from Española Island, is seen in a breeding centre at the Galapagos National Park on Santa Cruz Island. RODRIGO BUENDIA/AFP/Getty Images hide caption
Friday
Legalization of recreational marijuana may be a factor influencing increased use college-age young adults. Diverse Images/UIG/Getty Images hide caption
Thursday
Since marijuana doesn't benefit mother or baby it should be avoided, researchers say. But there is stronger evidence for the harms of alcohol and tobacco. Roy Morsch/Getty Images hide caption
Tuesday
Abby McLean of Northglenn, Colo., stands near the stretch of U.S. 85 in Adams County where she was pulled over for a DUI check in September 2014. Nathaniel Minor/CPR News hide caption
Tuesday
The first-place Sativa variety cannabis plant at the Oregon State Fair in Salem. Deena Prichep for NPR hide caption
Cannabis Growers Seek Blue Ribbons For Their Buds At Oregon's State Fair
Wednesday
A marijuana plant is displayed during the 2016 Cannabis Business Summit & Expo last month in Oakland, Calif. Justin Sullivan/Getty Images hide caption
Wednesday
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
Monday
Monday
A Hindu holy man in Kathmandu smokes a chillum, a traditional clay pipe, on March 6, the eve of a festival honoring the god Shiva. Prkash Mathema/AFP/Getty Images hide caption
Wednesday
A budtender prepares an edible sale for a customer at LivWell Broadway in Denver. Craig F. Walker/Denver Post via Getty Images hide caption
Tuesday
The psychoactive ingredient in marijuana is a fat-soluble compound called THC. iStockphoto hide caption
Thursday
Thursday
Alaska legalized pot this year and is the first state to have pot cafes where people can consume marijuana. Mark Thiessen/AP hide caption
Alaska's Pot Cafes Will Give Patrons A Taste Of Cannabis
Monday
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