Foreign Intelligence Surveillance Act of 1978

FISA is codified in 50 USC §§1801-1811, 1821-29, 1841-46, and 1861-62. The subchapters of FISA provide for:

• Electronic Surveillance
• Physical Searches
• Pen Registers and Trap & Trace Devices for Foreign Intelligence Purposes
• Access to certain Business Records for Foreign Intelligence Purposes

Section 6001 of the Intelligence Reform and Terrorism Prevention Act of 2004, expanded FISA to permit targeting of so-called "lone wolf" terrorists without requiring any showing that they are members of a terrorist group or agents of such a group or of any other foreign power.