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Here's their car tracking system summary: "The Newspaper is reporting that the leading private traffic enforcement camera vendors are seeking to establish a national vehicle tracking system in the United States using existing red-light and speed enforcement cameras. The system would utilize Automatic Number Plate Recognition (ANPR) to track vehicles passing surveillance cameras operated by these companies. If there are cameras positioned correctly the company will enable images and video to be taken of the driver and passengers. The nice thing in their view is that absolutely no warrants are needed. To gain public acceptance, the surveillance program is being initially sold as an aid for police looking to solve Amber Alert cases and locate stolen cars."
I copied several related stories below (but more will show up with a search). Somewhat related, it seems RFID chips are becoming more secure, some even claimed unclonable.