That's some good police work, Lou...

WASHINGTON – Two guns  used in high-profile shootings this year at the Pentagon and a Las Vegas courthouse both came from the same unlikely place: the police and court system of Memphis, Tenn.

Law enforcement officials told The Associated Press that both guns were once seized in criminal cases in Memphis. The officials described how the weapons made their separate ways from an evidence vault to gun dealers and to the shooters.

The use of guns that once were in police custody and were later involved in attacks on police officers highlights a little-known divide in gun policy in the United States: Many cities and states destroy guns gathered in criminal probes, but others sell or trade the weapons in order to get other guns or buy equipment such as bulletproof vests.