Upon presentation of appropriate credentials and upon consent of the owner or custodian, the Commissioner or his designee shall have the right to enter at any reasonable time onto the premises of any hotel, restaurant, summer camp, or campground to inspect, investigate, evaluate, conduct tests, or take samples for testing as he reasonably deems necessary in order to determine whether any provision of this title, any regulation of the Board, any order of the Board or Commissioner, or any condition in a license issued by the Board or Commissioner pursuant to this title is being violated. If the Commissioner or his designee is denied entry, he may apply to an appropriate circuit court for an inspection warrant authorizing such investigation, evaluation, inspection, testing, or taking of samples for testing as provided in Chapter 24 (§ 19.2-393 et seq.) of Title 19.2.