The State Department of Agriculture shall cause one or more of its officers, employees or deputies to inspect, as often as it may deem advisable, each place or conveyance licensed under ORS 601.050 or 601.080. However, each such place for disposal shall be inspected at least once during each license year. For the purpose of making such inspection, every authorized officer, employee and deputy of the department shall have free access to all premises licensed under such sections.