Most shopkeepers would be delighted if they could tell, just by looking at them, which shoppers had previously been detained on suspicion of shoplifting. Retailers also could prevent significant fraud losses if prior check-bouncers and identity thieves had their mugshots pinned to their jacket as they walked to the checkout line. While we don't walk around with this information visible to the world, our faces are almost always visible for all to see. Increasingly, that's just as useful.

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