Wisconsin Code § 909.015

General provision; illustrations
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By way of illustration only, and not by way of limitation, the following are examples of authentication or identification conforming with the
requirements of s. 909.01:
(1) TESTIMONY OF WITNESS WITH KNOWLEDGE. Testimony of
a witness with knowledge that a matter is what it is claimed to be.
(2) NONEXPERT OPINION ON HANDWRITING. Nonexpert opinion as to the genuineness of handwriting, based upon familiarity
not acquired for purposes of the litigation.
(3) COMPARISON BY TRIER OF FACT OR EXPERT WITNESS.
Comparison by the trier of fact or by expert witnesses with specimens which have been authenticated.
(4) DISTINCTIVE CHARACTERISTICS AND THE LIKE. Appearance, contents, substance, internal patterns, or other distinctive
characteristics, taken in conjunction with circumstances.
(5) VOICE IDENTIFICATION. Identification of a voice, whether
heard firsthand or through mechanical or electronic transmission
or recording, by opinion based upon hearing the voice at any time
under circumstances connecting it with the alleged speaker.
(6) TELEPHONE CONVERSATIONS. Telephone conversations,
by evidence that a call was made to the number assigned at the
time by the telecommunications company to a particular person
or business, if:
(a) In the case of a person, circumstances, including self-identification, show the person answering to be the one called; or
(b) In the case of a business, the call was made to a place of
business and the conversation related to business reasonably
transacted over the telephone.
(7) PUBLIC RECORDS OR REPORTS. Evidence that a writing
authorized by law to be recorded or filed and in fact recorded or
filed in a public office, or a purported public record, report, statement, or data compilation, in any form, is from the public office
where items of this nature are kept.
(8) ANCIENT DOCUMENTS OR DATA COMPILATIONS. Evidence that a document or data compilation, in any form:
(a) Is in a condition that creates no suspicion concerning its
authenticity;
(b) Was in a place where it, if authentic, would likely be; and
(c) Has been in existence 20 years or more at the time it is
offered.
(9) PROCESS OR SYSTEM. Evidence describing a process or
system used to produce a result and showing that the process or
system produces an accurate result.
(10) METHODS PROVIDED BY STATUTE OR RULE. Any
method of authentication or identification provided by statute or
by other rules adopted by the supreme court.

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