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en.wikipedia.org/wiki/Pen_register

A pen register, or dialed number recorder (DNR), is an electronic device that records all ... The United States statutes governing pen registers are codified under 18 U.S.C., Chapter 206. ... In Katz v. United States (1967), the United States Supreme Court established its "reasonable expectation of privacy" test. It overturned ...

www.eff.org/cases/cellphone-tracking-cases-usa-v-pen-register

EFF fought the government's attempts to track the location of a mobile phone user without sufficient evidence. The government had argued that it did not need to ...

www.law.cornell.edu/uscode/text/18/part-II/chapter-206

18 U.S. Code Chapter 206 - PEN REGISTERS AND TRAP AND TRACE DEVICES ... 3121 - General prohibition on pen register and trap and trace device use; ...

www.justice.gov/opa/press-release/file/956486/download

Apr 12, 2017 ... signed by this Court in the matter of United States v. Peter Yuryuvich ... Nonetheless, the United States is applying for a Pen Register and Trap ...

epic.org/foia/doj/pen-reg-trap-trace

Several of EPIC's recommendations, including better reporting on government surveillance activities, were incorporated in the USA FREEDOM Act. (May.

www.oyez.org/cases/1978/78-5374

Mar 28, 1979 ... Did the use of a pen register without a warrant violate the Fourth Amendment protection against ... Smith v. Maryland ... 442 US 735 (1979) ...

cyber.harvard.edu/privacy/Introduction%20to%20Government%20Investigations.htm

In Module V we take up the complicated question of how the new USA Patriot Act ... A Pen Register records telephone numbers called from a particular phone.

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

Pen registers are surveillance devices that capture the phone numbers dialed ... Smith v. Maryland, 442 U.S. 735, 742 (1979). Accordingly, the pen register and ...

supreme.justia.com/cases/federal/us/434/159

United States v. New York Telephone Co., 434 U.S. 159 (1977) ... The District Court ruled adversely to respondent, holding that pen registers are not governed  ...