                 TITLE 18--CRIMES AND CRIMINAL PROCEDURE
 
                       PART II--CRIMINAL PROCEDURE
 
          CHAPTER 206--PEN REGISTERS AND TRAP AND TRACE DEVICES
 
Sec. 3124. Assistance in installation and use of a pen register 
        or a trap and trace device
        
    (a) Pen Registers.--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) Trap and Trace Device.--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 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) Compensation.--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 Against a Provider Disclosing Information 
Under This Chapter.--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 the terms of a 
court order under this chapter or request pursuant to section 3125 of 
this title.
    (e) Defense.--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.
    (f) Communications Assistance Enforcement Orders.--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.

(Added Pub. L. 99-508, title III, Sec. 301(a), Oct. 21, 1986, 100 Stat. 
1870; amended Pub. L. 100-690, title VII, Secs. 7040, 7092(b), (d), Nov. 
18, 1988, 102 Stat. 4399, 4411; Pub. L. 101-647, title XXXV, Sec. 3575, 
Nov. 29, 1990, 104 Stat. 4929; Pub. L. 103-414, title II, 
Sec. 201(b)(2), Oct. 25, 1994, 108 Stat. 4290.)

                       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 (Sec. 1001 et seq.) 
of chapter 9 of Title 47, Telegraphs, Telephones, and Radiotelegraphs. 
For complete classification of this Act to the Code, see Short Title 
note set out under section 1001 of Title 47 and Tables.


                               Amendments

    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, Secs. 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, Sec. 7092(b)(1), inserted ``or request 
pursuant to section 3125 of this title'' after ``this chapter''.
    Subsec. (e). Pub. L. 100-690, Sec. 7092(b)(2), inserted ``under this 
chapter, a request pursuant to section 3125 of this title'' after 
``court order''.

                  Section Referred to in Other Sections

    This section is referred to in section 3123 of this title.
