IPR will have the authority to issue subpoenas for the purpose of compelling witness testimony or the production of documents, photographs, or any other evidence necessary for IPR to fully and thoroughly investigate a complaint or conduct a review. IPR personnel will not subpoena a sworn Bureau member employed by the Portland Police Bureau, but is authorized to direct Bureau members to cooperate with administrative investigations as described in Sections 3.21.120 and 3.21.220. Any person who fails to comply with a subpoena will be subject to contempt proceedings as prescribed by State law; provided that such persons will not be required to answer any question or act in violation of rights under the constitutions of the State or of the United States.