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An Amazon Echo, circa 2015, perched on a table beside a lamp. Not pictured: the actual Amazon Echo referenced in the case against James Bates. Mark Lennihan/AP hide caption

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Mark Lennihan/AP

Amazon's personal assistant device Echo, powered by the voice recognition program Alexa, is one of the most popular gifts this holiday season. Luke MacGregor/Bloomberg/Getty Images hide caption

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Luke MacGregor/Bloomberg/Getty Images

As We Leave More Digital Tracks, Amazon Echo Factors In Murder Investigation

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