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

Millions of dollars worth of $1 coins languish in a vault at the Federal Reserve Bank of Richmond's Baltimore branch. John W. Poole/NPR hide caption

itoggle caption John W. Poole/NPR

Ernie Lopez is serving a 60-year prison sentence for a crime he, and medical experts, said he didn't commit. Courtesy of Frontline hide caption

itoggle caption Courtesy of Frontline