CRAZY! Didn't even know this techonology had been invented. Boston has just add the Shot Spotter technology to their "gun filled areas." Click here to learn more. Shot Spotter is a system that tells police when a shot has been fired 3 seconds after the triggered is pulled. They can tell within 10 feet where a gun has been fired.
Unlike "Minority Report" where the police are there BEFORE the crime occurs, this allows police to be their within minutes of a crime.
Apparently Charleston has this system as well. Crimals be WARNED!