pen register

Definition of "pen register"
  1. A tool used to record outgoing phone numbers dialed from a specific telephone when sanctioned by a court for law enforcement purposes
How to use "pen register" in a sentence
  1. The investigator received permission to use a pen register to trace the suspect's calls.
  2. Due to the seriousness of the criminal investigation, a pen register was installed to monitor who the suspect was contacting.
  3. The court approved the use of a pen register to aid in the ongoing investigation.

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