Use of pen register or trap and trace device restricted
Wis. Stat. § 968.34
in effect(1) Except as provided in this section, no person may install or use a pen register or a trap and trace device without first obtaining a court order under s. 968.36 or 18 USC 3123 or 50 USC 1801 to 1811.
(2) The prohibition of sub. (1) does not apply with respect to the use of a pen register or a trap and trace device by a provider of electronic or wire communication service:
(a) Relating to the operation, maintenance and testing of a wire or electronic communication service or to the protection of the rights or property of the provider, or to the protection of users of that service from abuse of service or unlawful use of service;
(b) To record the fact that a wire or electronic communication was initiated or completed in order to protect the provider, another provider furnishing service toward the completion of the wire communication, or a user of that service, from fraudulent, unlawful or abusive use of service; or
(c) Where the consent of the user of that service has been obtained.
(2m) The prohibition of sub. (1) does not apply to a telephone caller identification service authorized under s. 196.207 (2).
(3) Whoever knowingly violates sub. (1) may be fined not more than $10,000 or imprisoned for not more than 9 months or both.
Source: WI Statutes (Official Site)URL: https://docs.legis.wisconsin.gov/document/statutes/968.34Fetched: 10/7/2026