The department may designate ports of entry of all transportation companies carrying petroleum products into this state for sale or consignment and may hold or delay any car or other vehicle of transportation entering this state carrying such products for sale or consignment until samples thereof have been obtained for inspection and analysis and until any other required information regarding the products contained in the shipment has been secured. The department may not hold or delay any shipment or consignment of petroleum products at the port of entry if the transportation company carrying such products will permit proper inspection and sampling of shipments or consignments at convenient designated points without the state, and will permit the inspection of transportation records and provide adequate information regarding the records of cars or other vehicles carrying such products at division points or at other places within or without the state where such cars or other vehicles, in normal practice, are stopped and held for switching and rearrangement or where ample opportunity is provided for proper inspection and sampling. The failure on the part of a transportation company or any of its officers or employees to hold any car or other vehicle of transportation for inspection is a class B misdemeanor.