The National Security Agency conducted a series of tests in 2010 and 2011 in which it tracked the locations of U.S. cellphone users in order to collect bulk data, but the NSA eventually ditched the plan, the agency's top officials confirmed at a Senate Judiciary Committee hearing on Wednesday. "NSA received samples in order to test the ability of its systems to handle the data format, but that data was not used for any other purpose and was never available for intelligence analysis purposes," James Clapper, the NSA's director of national intelligence testified.

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