FBI lawyers raised the concerns beginning in late October 2004 but did not closely scrutinize the practice until last year, FBI officials acknowledged. They also did not understand the scope of the problem until the Justice Department launched an investigation, FBI officials said.
Under pressure to provide a stronger legal footing, counterterrorism agents last year wrote new letters to phone companies demanding the information the bureau already possessed. At least one senior FBI headquarters official -- whom the bureau declined to name -- signed these "national security letters" without including the required proof that the letters were linked to FBI counterterrorism or espionage investigations, an FBI official said.
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