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This is reminiscent of some technology and technique learned and developed for operations in Iraq to go after IED planters. Basically once an event is alerted (ex truck stolen; someone abducted, etc) they backtrack or fwdtrack movements and see where perps came from or went to.

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Now imagine what happens when they can look at a city, or the whole country, or world, and select one individual and backtrack their entire lives. With audio, recorded from all the devices that surround us.

If you're one of a handful of megacorps collecting phone location data, contact data, purchase data, etc, this seems like it would already be trivial. They don't need a camera physically looking at you (and they often have those too).

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