Documents filed with the United States Patent and Trademark Office (USPTO) apparently reveals that Walmart is working on a system that can be used to capture beeps produced by a scanner and the rustling of bags at checkout to find out the number of items in a transaction or even the number of bags used.

This can raise serious privacy issue from its shoppers and employees. According to the patent filing, the system would capture a variety of sounds. These sounds will be used to analys employees’ performance and effectiveness at checkout.

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