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#11
Actually isn't illegal in some states including Arizona, according to that ninth circuit court ruling. They don't need a warrant or anything to put it on your car for any reason they want as long as it's outside your property in the open, not in a garage. Driveways are fair game. Beyond ridiculous, but true. Basically what this story is about.
Ninth Circuit Court: Secret GPS Tracking is Legal | Executive Gov
Caught Spying on Student, FBI Demands GPS Tracker Back | Threat Level | Wired.com