Tennessee Code Title 5. Counties § 5-1-140

(a) The general assembly occupies the entire field of the regulation of shopping carts, including, but not limited to, their purchase, use, taxation, manufacture, ownership, sale, storage, and transportation, to the exclusion of all county or metropolitan government laws, ordinances, resolutions, enactments, or regulations.  A county or metropolitan government, or any agency, department, or official of a county or metropolitan government, shall not adopt an ordinance, resolution, or other regulation requiring a business to adopt a shopping cart policy of any nature or imposing a fee or fine on a business related to shopping carts.

(b) As used in this section, “shopping cart” means a cart, trolley, basket, buggy, or other similar device supplied and owned by a retailer for use by customers and employees for the transport of merchandise.