Wis. Admin. Code HA § 3.07
The division or the administrative law judge may issue a subpoena, under the same procedure and in the same form as provided by s. 805.07(1), Stats., at a party's request if it appears that the testimony will be relevant and reasonably necessary for a full and fair hearing. The administrative law judge may require the party to provide written justification for the subpoena requested. A subpoena requiring the production of material may be issued if the person requesting the subpoena specifies the documents to be presented by the subpoenaed witness and if the request is found reasonable by the administrative law judge. The party requesting the subpoena is responsible for service and for fees.
Wis. Admin. Code Department of Administration-Division of Hearings and Appeals § HA 3.07