Review of the FBI's Use of National Security Letters: Assessment of Corrective Actions an Examination of NSL Usage in 2006 [March 2008] [open pdf - 126MB]
"The USA Patriot Improvement and Reauthorization Act of 2005 (Patriot Reauthorization Act or the Act) directed the Department of Justice (Department or DOJ) Office of the Inspector General (OIG) to review, among other things, 'the effectiveness and use, including any improper or illegal use, of national security letters issued by the Department of Justice.' The Act required the OIG to conduct reviews on the Federal Bureau of Investigation's (FBI) use of national security letters (NSL) for two separate time periods. The OIG's first report on the FBI's use of NSLs, issued on March 9, 2007, covered calendar years 2003 through 2005. This is the OIG's second report on the FBI's use of NSLs. In this report we describe and assess the response by the FBI and the Department to the serious misuse of NSL authorities that our first report described. In addition, as requested by the Patriot Reauthorization Act, this report describes the FBI's use of NSLs in calendar year 2006."
U.S. Department of Justice, Office of the Inspector General: http://www.usdoj.gov/oig/