The CES gadget show this year is all-in on surveillance technology — from the face scanner that will check in some attendees to the cameras-everywhere array of digital gadgets.
Travel through the sprawling Las Vegas consumer tech conference, and you'll find devices that see, hear and track the people they encounter.
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Some also analyze people's looks and behavior.
The gadgets bring convenience but also serve as powerful spying tools. Skeptics who raise privacy and security concerns at CES can be easily drowned out in the flashy spectacle of gee-whiz technology.
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CES runs Tuesday to Friday after two days of media previews.
