166. Any person authorized by the Régie to make an investigation may(1) stop a motor vehicle or other conveyance when he has reasonable grounds for believing that it is transporting an agricultural product, enter it and inspect the product;
(2) at any reasonable time, enter the office of a marketing board or an establishment or premises used for producing or marketing an agricultural product or the office of an undertaking producing or marketing an agricultural product, inspect the product and obtain a sample of it.