Wisconsin Statutes Civil Procedure (Ch. 799 to 847) § 805.07. Subpoena

(2) Subpoena requiring the production of material. (a) A subpoena may command the person to whom it is directed to produce the books, papers, documents, electronically stored information, or tangible things designated therein. A subpoena may specify the form or forms in which electronically stored information is to be produced. A command in a subpoena to produce documents, electronically stored information, or tangible things requires the responding party to permit inspection, copying, testing, or sampling of the materials.

(b) Notice of a 3rd-party subpoena issued for discovery purposes shall be provided to all parties at least 10 days before the scheduled deposition in order to preserve their right to object. If a 3rd-party subpoena requests the production of books, papers, documents, electronically stored information, or tangible things that are within the scope of discovery under s. 804.01(2)(a), those objects shall not be provided before the time and date specified in the subpoena. The provisions under this paragraph apply unless all of the parties otherwise agree.

(c) If a subpoena does not specify a form for producing electronically stored information, the person responding shall produce it in a form or forms in which it is ordinarily maintained or in a reasonably usable form or forms. The person responding need not produce the same electronically stored information in more than one form.

(d) If information inadvertently produced in response to a subpoena is subject to a claim of privilege or of protection as trial preparation material, the party making the claim may notify any party that received the information of the claim and the basis for it. After being notified, a party must promptly return, sequester, or destroy the specified information and any copies it has; must not use or disclose the information until the claim is resolved; must take reasonable steps to retrieve the information if the party disclosed it before being notified; and may promptly present the information to the court under seal for a determination of the claim. The producing party must preserve the information until the claim is resolved.

(4) Form. (a) The subpoena shall be in the following form:

(b) For a subpoena requiring the production of material, the following shall be inserted in the foregoing form: You are further commanded to bring with you the following: [describing as accurately as possible the books, papers, documents or other tangible things sought].