03/18/2014 11:55 am ET Updated Mar 18, 2014

NSA Reaches ‘Into The Past' To Replay Phone Calls

The National Security Agency has built a surveillance system capable of recording “100 percent” of a foreign country’s telephone calls, enabling the agency to rewind and review conversations as long as a month after they take place, according to people with direct knowledge of the effort and documents supplied by former contractor Edward Snowden.

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