en.wikipedia.org/wiki/Pen_register

The term pen register originally referred to a device for recording telegraph signals on a strip of paper. Samuel F. B. Morse's 1840 telegraph ...

www.law.cornell.edu/uscode/text/18/3121

General prohibition on pen register and trap and trace device use; exception ... (1 ). relating to the operation, maintenance, and testing of a wire or electronic ...

www.law.cornell.edu/uscode/text/18/3122

Application for an order for a pen register or a trap and trace device ... (1). An attorney for the Government may make application for an order or an extension of  ...

www.cdt.org/files/security/000404amending.shtml

Pen registers are surveillance devices that capture the phone numbers .... ( Limiting language on geographic extent already appears in the statute: 3123(b)(1 )(C) ...

www.rcfp.org/electronic-communications-surveillance/iii-electronic-communications-surveillance-authorities/elec-1

The so-called “Pen/Trap” statute regulates the collection of non-content information related to electronic communications in real time. Pen registers and trap and ...

www.washingtonpost.com/news/politics/wp/2018/05/04/the-very-big-difference-between-a-wiretap-and-how-the-feds-tracked-michael-cohen

May 4, 2018 ... There was no wiretap on Cohen's phones, it turns out, but instead NBC was informed that authorities had obtained a “pen register” on Cohen.

uscode.house.gov/view.xhtml?path=/prelim@title18/part2/chapter206&edition=prelim

General prohibition on pen register and trap and trace device use; exception. ... ( 1) relating to the operation, maintenance, and testing of a wire or electronic ...

www.cybertelecom.org/security/ecpatrapandtrace.htm

Jun 12, 2017 ... Transactional Records: Pen Registers & Trap and Trace. Law enforcement officers .... 18 U.S.C. § 3123(a)(1); 18 U.S.C. § 3127(2). Court orders ...

law.lis.virginia.gov/vacode/title19.2/chapter6/section19.2-70.2

1. The identity of the officer making the application and the identity of the ... C. Installation and use of a pen register or a trap and trace device shall be authorized ...