CES is all-in on surveillance technology, from face scanners for checking in some attendees to showcasing devices that can that see, hear, and track people (Matt O'brien/Associated Press)

Matt O'brien / Associated Press:
CES is all-in on surveillance technology, from face scanners for checking in some attendees to showcasing devices that can that see, hear, and track people  —  From the face scanner that will check in some attendees to the cameras-everywhere array of digital products, the CES gadget show …

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