Cal. Bus. & Prof. Code § 12213

Each sealer may, in the general performance of his duty, without formal warrant, enter or go into or upon, any stand, place, building or premises or stop any vendor, peddler, junk-dealer, driver of a coal, ice, delivery, or other wagon or vehicle, containing commodities for sale or delivery and, if necessary, require him to proceed with the commodity to some place which the sealer may specify for the purpose of making the proper tests.