Montana · Montana Code Annotated — Title 46, Criminal Procedure
MCA Title 46 § 46-4-402: Limitations on use of pen register or trap and trace device
What this law says, in plain English
A person cannot install or use a pen register or trap and trace device without a court order, except for limited uses by communication service providers. Violation is a criminal offense punishable by up to 6 months incarceration and a $500 fine.
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