Miss. Code § 27-19-137
The agents of the Mississippi Department of Transportation and the State Tax Commission shall have the right to inspect at all reasonable times all motor vehicles operating upon the highways of this state and shall likewise have the authority to inspect and examine all records kept by any person relating or pertaining to the liability of any person for any tax imposed by the provisions of this article. They shall likewise have the power to require the production of any such records within this state, at any time and place designated by them, upon giving reasonable notice to the person having control and custody of such records. The Mississippi Department of Transportation and its representatives shall also have the authority and power to cause any vehicle engaged in the transportation of property upon the public highways of this state to submit to a weighing of such vehicle and the load thereon, either by means of portable or stationary scales, and may require that such vehicle be driven to the nearest scales for weighing. If a vehicle has been issued a registration card, such registration card shall be carried in such vehicle at all times.
Miss. Code § 27-19-137