The Mall of America in Bloomington, Minn., has implemented a security program aimed at aiding the government identify suspected terrorists. Jim Mone/AP hide caption

itoggle caption Jim Mone/AP

The Mall of America, one of the nation's largest shopping and entertainment venues, is also home to its own counterterrorism unit. Dawn Villela/AP hide caption

itoggle caption Dawn Villela/AP

Tammy Marquardt, now 39, spent 14 years in prison for a crime she didn't commit. Joseph Shapiro/NPR hide caption

itoggle caption Joseph Shapiro/NPR

Mine helmets and painted crosses sit at the entrance to Massey Energy's Upper Big Branch coal mine on April 5, as a memorial to the 29 miners killed there one year earlier. Jeff Gentner/AP hide caption

itoggle caption Jeff Gentner/AP