GPS bullets are latest weapon for American police

The bullet is designed to make high-speed chases safer - enabling the authorities to track suspects without having to risk theirs or others' lives.

And in true spy fashion the system works by hitting a button inside a police car.

That triggers a lid to pop up releasing a bullet that shoots out and sticks to the car in front.

The system, dubbed Star chase

It costs $5,000 (£3,108) to install and each bullet costs $500 (£312).