Police car chases cause 14,000 injuries and 700 deaths per year, according to one study. Those numbers could drop significantly if police are able to use GPS bullets. The Starchase system can mount to a cop car's grill and shoots a stick-on GPS device at a suspects's vehicle. 

Right now the technology is being tested by some police departments, but its legality is unclear. The ACLU, a staunch defender of civil liberties, has said it's fine with GPS bullets being used when an officer has probable cause (e.g. in a car chase), but that any other use should follow the same requirements for a warrant established in the landmark US V Jones Supreme Court case

We wouldn't be mad if cops started using these GPS bullets. If innocent bystanders stay safe, as well as our civil liberties, it sounds good to us. 

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[via Ars Technica