Pen Register definition: An electronic surveillance device which attaches to a phone line and which registers every number dialed from a specific telephone. This surveillance device is not as effective as wire-tapping.
Pen Register: An electronic surveillance device which attaches to a phone line and which registers every number dialed from a specific telephone.
Law enforcement's court-approved access to communication, including wiretaps, pen registers, and traps and traces, are neither technically nor legally simple.
See also: Attorn, Public, Ordinary, Register, Were
 
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