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U.S. Code Title 18
Part II
Chapter 206
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Chapter 206: PEN REGISTERS AND TRAP AND TRACE DEVICES
Section 3121: General prohibition on pen register and trap and trace device use; exception
Section 3122: Application for an order for a pen register or a trap and trace device
Section 3123: Issuance of an order for a pen register or a trap and trace device
Section 3124: Assistance in installation and use of a pen register or a trap and trace device
Section 3125: Emergency pen register and trap and trace device installation
Section 3126: Reports concerning pen registers and trap and trace devices
Section 3127: Definitions for chapter