Title 18Crimes and Criminal ProcedureRelease 119-73

§3124 Assistance in installation and use of a pen register or a trap and trace device

Title 18 › Part PART II— - CRIMINAL PROCEDURE › Chapter CHAPTER 206— - PEN REGISTERS AND TRAP AND TRACE DEVICES › § 3124

Last updated Apr 6, 2026|Official source

Summary

When a government lawyer or an authorized law enforcement officer asks and a court orders it under section 3123(b)(2), a phone or internet company, landlord, custodian, or other person must immediately give the officers the information, facilities, and technical help needed to put in a pen register or a trap-and-trace device and do it quietly with as little service interference as possible. A trap-and-trace device’s results must be given to the officer named in the order at reasonable times during regular business hours unless the court says otherwise. Providers must be paid for reasonable costs they incur. No one can sue a provider for following a court order, a request under section 3125, or a foreign-government order that the Attorney General has certified to Congress as meeting section 2523, and relying in good faith on those authorizations is a complete defense. Orders may be issued under section 2522 to enforce Communications Assistance for Law Enforcement Act requirements.

Full Legal Text

Title 18, §3124

Crimes and Criminal Procedure — Source: USLM XML via OLRC

(a)Upon the request of an attorney for the Government or an officer of a law enforcement agency authorized to install and use a pen register under this chapter, a provider of wire or electronic communication service, landlord, custodian, or other person shall furnish such investigative or law enforcement officer forthwith all information, facilities, and technical assistance necessary to accomplish the installation of the pen register unobtrusively and with a minimum of interference with the services that the person so ordered by the court accords the party with respect to whom the installation and use is to take place, if such assistance is directed by a court order as provided in section 3123(b)(2) of this title.
(b)Upon the request of an attorney for the Government or an officer of a law enforcement agency authorized to receive the results of a trap and trace device under this chapter, a provider of a wire or electronic communication service, landlord, custodian, or other person shall install such device forthwith on the appropriate line or other facility and shall furnish such investigative or law enforcement officer all additional information, facilities and technical assistance including installation and operation of the device unobtrusively and with a minimum of interference with the services that the person so ordered by the court accords the party with respect to whom the installation and use is to take place, if such installation and assistance is directed by a court order as provided in section 3123(b)(2) of this title. Unless otherwise ordered by the court, the results of the trap and trace device shall be furnished, pursuant to section 3123(b) or section 3125 of this title, to the officer of a law enforcement agency, designated in the court order, at reasonable intervals during regular business hours for the duration of the order.
(c)A provider of a wire or electronic communication service, landlord, custodian, or other person who furnishes facilities or technical assistance pursuant to this section shall be reasonably compensated for such reasonable expenses incurred in providing such facilities and assistance.
(d)No cause of action shall lie in any court against any provider of a wire or electronic communication service, its officers, employees, agents, or other specified persons for providing information, facilities, or assistance in accordance with a court order under this chapter, request pursuant to section 3125 of this title, 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.
(e)A good faith reliance on a court order under this chapter, a request pursuant to section 3125 of this title, a legislative authorization, a statutory authorization, or a good faith determination that the conduct complained of was permitted by an order from a foreign government that is subject to executive agreement that the Attorney General has determined and certified to Congress satisfies section 2523, is a complete defense against any civil or criminal action brought under this chapter or any other law.
(f)Pursuant to section 2522, an order may be issued to enforce the assistance capability and capacity requirements under the Communications Assistance for Law Enforcement Act.

Legislative History

Notes & Related Subsidiaries

Editorial Notes

References in Text

The Communications Assistance for Law

Enforcement

Act, referred to in subsec. (f), is title I of Pub. L. 103–414, Oct. 25, 1994, 108 Stat. 4279, which is classified generally to subchapter I (§ 1001 et seq.) of chapter 9 of Title 47, Telecommunications. For complete classification of this Act to the Code, see

Short Title

note set out under section 1001 of Title 47 and Tables.

Amendments

2018—Subsec. (d). Pub. L. 115–141, § 104(3)(B)(i), amended subsec. (d) generally. Prior to amendment, text read as follows: “No cause of action shall lie in any court against any provider of a wire or electronic communication service, its officers, employees, agents, or other specified persons for providing information, facilities, or assistance in accordance with a court order under this chapter or request pursuant to section 3125 of this title.” Subsec. (e). Pub. L. 115–141, § 104(3)(B)(ii), amended subsec. (e) generally. Prior to amendment, text read as follows: “A good faith reliance on a court order under this chapter, a request pursuant to section 3125 of this title, a legislative authorization, or a statutory authorization is a complete defense against any civil or criminal action brought under this chapter or any other law.” 2001—Subsec. (b). Pub. L. 107–56, § 216(c)(6), inserted “or other facility” after “the appropriate line”. Subsec. (d). Pub. L. 107–56, § 216(c)(5), struck out “the terms of” before “a court order”. 1994—Subsec. (f). Pub. L. 103–414 added subsec. (f). 1990—Subsec. (b). Pub. L. 101–647 substituted “section 3123(b)” for “subsection 3123(b)”. 1988—Subsec. (b). Pub. L. 100–690, §§ 7040, 7092(d), inserted “, pursuant to subsection 3123(b) or section 3125 of this title,” after “shall be furnished” and “order” after last reference to “court”. Subsec. (d). Pub. L. 100–690, § 7092(b)(1), inserted “or request pursuant to section 3125 of this title” after “this chapter”. Subsec. (e). Pub. L. 100–690, § 7092(b)(2), inserted “under this chapter, a request pursuant to section 3125 of this title” after “court order”.

Statutory Notes and Related Subsidiaries

Effective Date

Section effective 90 days after Oct. 21, 1986, and, in case of conduct pursuant to court order or extension, applicable only with respect to court orders and extensions made after such date, with special rule for State authorizations of interceptions, see section 302 of Pub. L. 99–508, set out as a note under section 3121 of this title. Assistance to Law

Enforcement

Agencies Pub. L. 107–56, title II, § 222, Oct. 26, 2001, 115 Stat. 292, provided that: “Nothing in this Act [see

Short Title

of 2001 Amendment note set out under section 1 of this title] shall impose any additional technical obligation or requirement on a provider of a wire or electronic communication service or other person to furnish facilities or technical assistance. A provider of a wire or electronic communication service, landlord, custodian, or other person who furnishes facilities or technical assistance pursuant to section 216 [amending this section and section 3121, 3123, and 3127 of this title] shall be reasonably compensated for such reasonable expenditures incurred in providing such facilities or assistance.”

Reference

Citations & Metadata

Citation

18 U.S.C. § 3124

Title 18Crimes and Criminal Procedure

Last Updated

Apr 6, 2026

Release point: 119-73