The commissioner may conduct examinations and investigations of insurance matters, in addition to examinations and investigations expressly authorized, as he deems proper, upon reasonable and probable cause, to determine whether any person has violated any provisions of this code or to secure information useful in the lawful administration of any provision of this code. The commissioner, with the governor’s approval, may enter into interstate compacts with other states in the region to provide for a uniform climate for insurance coverage in the compacting states. The compacts may include uniform rating structures or negotiating use of regional ratings.