In the last few years, the feds have expanded efforts to collect tips about people's behavior in the real world. At a fusion center in Las Vegas, workers like Daniel Burns, a program coordinator, analyze suspicious activity reports. The ACLU on Thursday posted more than 1,800 of these reports that were gathered in central California. Monica Lam/Center for Investigative Reporting hide caption

itoggle caption Monica Lam/Center for Investigative Reporting

Police officials stand next to a bullet-ridden Seattle Metro bus on Aug. 12. A man with a history of mental illness shot and wounded the driver, then died in a chaotic shootout with police. Ted S. Warren/AP hide caption

itoggle caption Ted S. Warren/AP

Seattle law enforcement's mellow attitude toward pot was on display at this year's annual Hempfest, where the cops were at the gate — handing out bags of Doritos. Martin Kaste/NPR hide caption

itoggle caption Martin Kaste/NPR

Maj. Nidal Hasan faces 13 charges of murder and 32 of attempted murder for the November 2009 shootings at Fort Hood, Texas. Reuters/Landov hide caption

itoggle caption Reuters/Landov