By Judge Herbert B. Dixon Jr. (Ret.)
Tracking and surveillance are no longer the stuff of old espionage movies--the little black box covertly hidden underneath a car, a bug placed in a room, or an agent spying from the rooftop across the street. The most targeted surveillance subjects in the United States now voluntarily provide volumes of information that would amaze the clandestine agents of yesteryear. I am referring to that ever-present device that you rarely leave home without--your cell phone--an electronic gadget that constantly yields digital location data about your daily movements and travels.