The statutes that enable the government to gain legal access to telephone records, whether for law enforcement or intelligence purposes, are examined in a newly updated report (pdf) from the Congressional Research Service.
The report also discusses prohibitions on access to, or disclosure of, such records, along with exceptions to the prohibitions. See “Government Access to Phone Calling Activity and Related Records: Legal Authorities,” updated January 25, 2007.
Some other notable CRS products obtained by Secrecy News that are not readily available in the public domain include these (all pdf):
“Armenia, Azerbaijan, and Georgia: Security Issues and Implications for U.S. Interests,” updated February 1, 2007.
“Pipeline Safety and Security: Federal Programs,” updated January 25, 2007.
“Russian Political, Economic, and Security Issues and U.S. Interests,” updated January 18, 2007.
“Terrorist Capabilities for Cyberattack: Overview and Policy Issues,” updated January 22, 2007.