Margot Roosevelt writes in Time Magazine that marijuana is being secretly grown in national parks all over the U.S. Rangers wearing camouflage and carrying rifles creep around among the campers, trying to bust the park pot growers. Forest Service investigator Laura Mark says, "We're good at jungle warfare. We're the ninjas of the woods."
...Chris Cuomo reports for ABC News 20/20 that national parks are not always the bucolic places they're supposed to be. In many of them, park rangers are fighting drug dealers, smugglers, and even terrorists. "Just about any type of crime that goes on in any urban environment happens out here," says Dale Antonich, chief ranger at the Lake Mead...