Bumper Beepers
The most effective means of tailing a vehicle is with a bumper beeper. An electronic tailing device, the bumper beeper attaches to the underside of the victim's car. The device sends beeping signals to a receiver in the tailing vehicle. The closer the tailing vehicle gets to the target vehicle, the louder the beeps become. The more sophisticated beepers are equipped with a null switch, whereby a different tone in the beep is produced if the victim turns right or left. Bumper beepers have an effective range of from 1 to 5 miles. They are usually attached to the vehicle with powerful magnets, although heavy metal clamps are sometimes used. Beepers can be either battery powered or attached directly to the target vehicle's own electrical system.
Has anyone used or heard of these? What would the legal ramifications be?
P.S. I cut and paste this from 'Getaway' by Ronald George Eriksen II