18 U.S.C. § 3121 - U.S. Code - Unannotated Title 18. Crimes and Criminal Procedure § 3121. General prohibition on pen register and trap and trace device use; exception

(a) In general.--Except as provided in this section, no person may install or use a pen register or a trap and trace device without first obtaining a court order under section 3123 of this title or under the Foreign Intelligence Surveillance Act of 1978 (50 U.S.C. 1801 et seq.) or an order from a foreign government that is subject to an executive agreement that the Attorney General has determined and certified to Congress satisfies section 2523.

(b) Exception.--The prohibition of subsection (a) does not apply with respect to the use of a pen register or a trap and trace device by a provider of electronic or wire communication service--

(c) Limitation.--A government agency authorized to install and use a pen register or trap and trace device under this chapter or under State law shall use technology reasonably available to it that restricts the recording or decoding of electronic or other impulses to the dialing, routing, addressing, and signaling information utilized in the processing and transmitting of wire or electronic communications so as not to include the contents of any wire or electronic communications.

(d) Penalty.--Whoever knowingly violates subsection (a) shall be fined under this title or imprisoned not more than one year, or both.