The F.B.I. soon plans to issue a new edition of its manual, called the Domestic Investigations and Operations Guide, according to an official who has worked on the draft document and several others who have been briefed on its contents. The new rules add to several measures taken over the past decade to give agents more latitude as they search for signs of criminal or terrorist activity.
The F.B.I. recently briefed several privacy advocates about the coming changes. Among them, Michael German, a former F.B.I. agent who is now a lawyer for the American Civil Liberties Union, argued that it was unwise to further ease restrictions on agents’ power to use potentially intrusive techniques, especially if they lacked a firm reason to suspect someone of wrongdoing.
“Claiming additional authorities to investigate people only further raises the potential for abuse,” Mr. German said, pointing to complaints about the bureau’s surveillance of domestic political advocacy groups and mosques and to an inspector general’s findings in 2007 that the F.B.I. had frequently misused “national security letters,” which allow agents to obtain information like phone records without a court order.
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