There are basically two types of subpoena. The first is an order for someone to appear. The second is an order for someone to make documents or other items available to you. If you want either of these types of subpoena, you must prepare a subpoena form for the administrative law judge's signature. The second type of subpoena requires a justification as well, normally a letter attached to the subpoena. The subpoena may not be served by a party. Process servers can be found in the yellow pages. A copy of the subpoena, along with an affidavit from the person serving the original subpoena must be returned to the Office of Administrative Hearings. Subpoena forms, along with a guide on how to fill them out and have them served, are available through the Office of Administrative Hearings. Since you are required to have the subpoena served, you should request subpoenas well in advance of the hearing. For more information see OAH procedural rule 19-113. See also this sample subpoena form.