CBS: A growing number of stores are using discrete and sophisticated technology — including mannequins with facial-recognition cameras hidden in their eyes — to track shopper demographics in an effort to boost sales. Retailers say the marketing data technology allows them to cater their business to customers better, but it’s also raising privacy concerns.

Alfonso Perez built a system called Shopperception that Walmart has utilized. It uses motion-sensored cameras to track a shopper’s product choice on a shelf and the time it takes to make a decision. Perez’s business has doubled in the past year.

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