Wisconsin Statutes Testimony, Documentary Evidence and Presumptions (Ch. 885 to 891) § 885.365. Recorded telephone conversation

(a) Such recording is made in a manner other than by interception and the person whose conversation is being recorded is informed at that time that the conversation is being recorded and that any evidence thereby obtained may be used in a court of law; or such recording is made through a recorder connector provided by the telecommunications utility as defined in s. 196.01(10) or a telecommunications carrier as defined in s. 196.01(8m) in accordance with its tariffs and which automatically produces a distinctive recorder tone that is repeated at intervals of approximately 15 seconds;

(b) The recording is made by a telecommunications utility as defined in s. 196.01(10), a telecommunications carrier as defined in s. 196.01(8m) or its officers or employees for the purpose of or incident to the construction, maintenance, conduct or operation of the services and facilities of such public utilities, or to the normal use by such public utilities of the services and facilities furnished to the public by such public utility; or

(c) The recording is made by a fire department or law enforcement agency to determine violations of, and in the enforcement of, s. 941.13.