Va. Code Ann. § 3.2-5614

With respect to the enforcement of this chapter and any other acts dealing with weights and measures that he is, or may be, empowered to enforce, the Commissioner is hereby vested with police powers, and is authorized to arrest any violator of the said acts and to seize for use as evidence, without formal warrant, incorrect or unsealed weights and measures or amounts or packages of commodity, found to be used, retained, offered, or exposed for sale, or sold in violation of law. In the performance of his official duties, the Commissioner is authorized to enter and go into or upon, without formal warrant, any structure or premises, and to stop any person whatsoever if necessary to apprehend such person and to require him to proceed, with or without any vehicle of which he may be in charge, to some place that the Commissioner may specify.