The state auditor is entitled to access all accounts, books, records, reports, and vouchers of every agency, as necessary for purposes of conducting an audit, investigating improper governmental conduct, and ensuring that effective internal controls are in place and maintained. For purposes of this Act, "agency" means each association, authority, board, including the Board of Regents and the South Dakota Board of Technical Education, commission, committee, council, department, division, office, officer, task force, or other agent of the state vested with the authority to exercise any portion of the state's sovereignty. For purposes of this section, "improper governmental conduct" means fraud, misappropriation, or misfeasance.