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'stingray' Phone Tracker Fuels Constitutional Clash

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Harris StingRay II

A Harris StingRay II, one of several devices dubbed 'stingrays.'

Credit: U.S. Patent and Trademark Office

For more than a year, federal authorities pursued a man they called simply "the Hacker." Only after using a little known cellphone-tracking device—a stingray—were they able to zero in on a California home and make the arrest.

From The Wall Street Journal
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