Detective Mark Williams (right) speaks with an officer in Richmond, Va. A decade ago, amid a surge in violent crime, Richmond police were identifying relatively few murder suspects. So the police department refocused its efforts to bring up its "clearance rate." Alex Matzke for NPR hide caption

itoggle caption Alex Matzke for NPR

Retired agent Michael Vigil on a search and destroy operation in the Colombian jungle. "As an undercover, you're basically kind of an independent operator ... and it's very addictive." says Laura Brodie, a criminal and forensic psychologist. Courtesy Michael Vigil hide caption

itoggle caption Courtesy Michael Vigil

The Hartford Police Department is one of a number of police departments across the country that are offering up their parking lots as "safe zones" for Craigslist transactions. Courtesy of the Hartford Police Department hide caption

itoggle caption Courtesy of the Hartford Police Department

Indiana Gov. Mike Pence holds a news conference at the Statehouse in Indianapolis, on Thursday, where he signed into law a bill that would allow business owners with strong religious convictions to refuse to provide services to same-sex couples. Michael Conroy/AP hide caption

itoggle caption Michael Conroy/AP

Congress tries every year to plug a loophole that would otherwise result in a 21 percent cut in Medicare doctors' pay. But it doesn't exactly always tighten its belt in the process. Key Wilde/Getty Images hide caption

itoggle caption Key Wilde/Getty Images

In this Aug. 14, 2013 file photo, former Illinois Rep. Jesse Jackson Jr. and his wife, Sandra, arrive at federal court in Washington to learn their fates when a federal judge sentences the one-time power couple for misusing $750,000 in campaign money. Susan Walsh/AP hide caption

itoggle caption Susan Walsh/AP

Maranda Brooks stands in January outside a payday loans business that she used to frequent. Troubled by consumer complaints and loopholes in state laws, federal regulators are proposing expansive, first-ever rules on payday lenders, aimed at helping cash-strapped borrowers from falling into a cycle of debt. Tony Dejak/AP hide caption

itoggle caption Tony Dejak/AP

"There's no reason to believe that exposure to arsenic in food and wine is above levels that are considered to be safe," says Susan Ebeler, a professor and chemist in the Foods For Health Institute at the University of California, Davis. Erik Schelzig/ASSOCIATED PRESS hide caption

itoggle caption Erik Schelzig/ASSOCIATED PRESS

Two years ago, Charles Ramsey, Philadelphia's police commissioner, called for a federal review of the city's police practices. Ramsey called for a similar federal inquiry during his tenure as Washington, D.C.'s police chief. Matt Rourke/AP hide caption

itoggle caption Matt Rourke/AP