50 U.S.C. § 1841 - U.S. Code - Unannotated Title 50. War and National Defense § 1841. Definitions

(A) whose telephone line was subject to the installation or use of a pen register or trap and trace device authorized by this subchapter; or

(B) whose communication instrument or device was subject to the use of a pen register or trap and trace device authorized by this subchapter to capture incoming electronic or other communications impulses.

(4)(A) The term “specific selection term”--

(B) A specific selection term under subparagraph (A) does not include an identifier that does not limit, to the greatest extent reasonably practicable, the scope of information sought, consistent with the purpose for seeking the use of the pen register or trap and trace device, such as an identifier that--

(C) For purposes of subparagraph (A), the term “address” means a physical address or electronic address, such as an electronic mail address or temporarily assigned network address (including an Internet protocol address).

(D) Nothing in this paragraph shall be construed to preclude the use of multiple terms or identifiers to meet the requirements of subparagraph (A).