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Source: Inspector Generals of the Justice Department, the Defense Department, the Central Intelligence Agency, the National Security Agency and the Office of the Director of National Intelligence (via NY Times)
From New York Times story (U.S. Wiretapping of Limited Value, Officials Report):
While the Bush administration had defended its program of wiretapping without warrants as a vital tool that saved lives, a new government review released Friday said the program’s effectiveness in fighting terrorism was unclear.
The report, mandated by Congress last year and produced by the inspectors general of five federal agencies, found that other intelligence tools used in assessing security threats posed by terrorists provided more timely and detailed information.
Most intelligence officials interviewed “had difficulty citing specific instances” when the National Security Agency’s wiretapping program contributed to successes against terrorists, the report said.
While the program obtained information that “had value in some counterterrorism investigations, it generally played a limited role in the F.B.I.’s overall counterterro"