The US city Los Angeles is trying to put an end to high-speed pursuits with a sticky GPS device that police officers can fire at fleeing vehicles. Police are to start testing the device on a four- to six-month trial before deciding on wider adoption. The devices are fired by officers from compressed air launchers and are encased in a sticky compound that attaches itself to the fleeing vehicle, transmitting radio signals that allow police to track the vehicle from a distance. This device allows the police not to have to pursue the car. Many critics question the wisdom of high speed chases because of the potential danger to officers and bystanders.