The suitcase-size surveillance tool commonly called a StingRay mimics a cellphone tower, allowing authorities to track individual cellphones in real time. Users of the device, which include scores of law enforcement agencies, sign a non-disclosure agreement when they purchase it, pledging not to divulge its use, even in court cases against defendants the device helped capture. Those restrictions remain in place despite a decision last year by the police in Charlotte to disclose to judges more details about . . .
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