pen register
pen reg·is·ter n [perhaps from the original use of a pen to mark the dots or dashes used in counting the numbers dialed]: a device that registers the numbers dialed from a telephone compare wiretap
◇ A court order is always required for the use of a pen register in a criminal investigation, but such use has not been considered a search or interception of communication by the U.S. Supreme Court. Some states have disagreed and discern a privacy interest in such information.

Merriam-Webster’s Dictionary of Law. . 1996.

pen register
n.
A device that records the numbers dialed on a telephone; see also eavesdrop, wiretapping

The Essential Law Dictionary. — Sphinx Publishing, An imprint of Sourcebooks, Inc. . 2008.


pen register
A device that makes a record of the phone numbers called from a particular phone. When a court authorizes it, a law enforcement agency may use a pen register in a criminal investigation.
Category: Criminal Law
Category: Small Claims Court & Lawsuits

Nolo’s Plain-English Law Dictionary. . 2009.


pen register
n. A device that records dialed telephone numbers. Pen registers have been deemed by federal authorities to be beyond the scope of wiretapping restrictions, because they do not intercept, hear, or monitor conversations. Some legislatures, however have ruled that their citizens are entitled to a higher degree of privacy.

Webster's New World Law Dictionary. . 2000.


pen register
A device that decodes or records electronic impulses, allowing outgoing numbers from a telephone to be identified.

Dictionary from West's Encyclopedia of American Law. 2005.


pen register
A device that decodes or records electronic impulses, allowing outgoing numbers from a telephone to be identified.

Short Dictionary of (mostly American) Legal Terms and Abbreviations.

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