[z3n]

Remote sensing technology along with mass data storage will someday (if it isn't now) be able to allow intelligence agencies track suspects/criminals/terrorists movements, either real-time, or after the fact.

[FreedomPoster]

Don't forget about tracking of cell phones as well as vehicles with On-Star, tollway transponders, and similar devices.

Big Brother is watching you.

[gridlock]

Did you ever see Enemy of the State? In the movie, the CIA was able to review satellite imagery to track a car that had left a store some time before to its eventual destination. Pretty cool stuff. No reason why it could not be done. I think the JSTARS system does the same thing on a theater-wide basis, from an airborne platform.