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Federal Agents Used Controversial Trackers Without Warrants

The e-mails acquired by the San Francisco-based Electronic Frontier Foundation and American Civil Liberties Union in March -- following an April 2012 Freedom of Information Act request -- suggest that investigators' use of the devices was widespread. Agents apparently used the stingrays while only seeking permission from a judge to use a "pen register," which is a less-invasive way of tracking cellphone signals.

Wednesday, April 3, 2013
SF Weekly

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