The BBC reports that police in the U.S. are now using 'GPS bullets,' a device they can shoot at fleeing vehicles in order to track them. They're designed to make high-speed chases safer. The pursuing police car presses a button, a lid pops open, and a GPS bullet is fired which becomes attached to the fleeing car. The car can then be tracked from a distance in real-time without the need for a high-speed pursuit.

http://tech.slashdot.org/story/13/10...yle-gps-bullet