From CNET:
At my bodega down the block, photos of shoplifters sometimes litter the windows, a warning to would-be thieves that they’re being watched.
Those unofficial wanted posters come and go, as incidents fade from the owner’s memory. But with facial recognition, getting caught in one store could mean a digital record of your face is shared across the country. Stores are already using the technology for security purposes and can share that data — meaning that if one store considers you a threat, every business in that network could come to the same conclusion.