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The Central Intelligence Agency played a crucial role in helping the Justice Department develop technology that scans data from thousands of U.S. cellphones at a time, part of a secret high-tech alliance between the spy agency and domestic law enforcement, according to people familiar with the work.
The CIA and the U.S. Marshals Service, an agency of the Justice Department, developed technology to locate specific cellphones in the U.S. through an airborne device that mimics a cellphone tower, these people said