Iowa Admin. Code r. 495-17.7
To the extent permitted by any applicable provision of law, the subject of a confidential record under the jurisdiction of the agency may consent to disclosure to a third party of that portion of the record concerning the subject except as provided in subrule 17.12(1). The consent must be in writing and must identify the particular record or records that may be disclosed, the particular person or class of persons to whom the record may be disclosed and, where applicable, the time period during which the record or information may be disclosed. The subject and, where applicable, the person to whom the record is to be disclosed, must provide proof of identity. Appearance of legal counsel, or a duly appointed representative on behalf of a subject of a confidential record, is deemed to constitute consent for the agency to disclose records about that person to the person's representative.
Iowa Admin. Code r. 495-17.7