Subchapter III. PEN REGISTERS AND TRAP AND TRACE DEVICES FOR FOREIGN INTELLIGENCE PURPOSES

• § 1841 - Definitions
• § 1842 - Pen registers and trap and trace devices for foreign intelligence and international terrorism investigations
• § 1843 - Authorization during emergencies
• § 1844 - Authorization during time of war
• § 1845 - Use of information
• § 1846 - Congressional oversight