Tennessee Code Title 55. Motor and Other Vehicles § 55-23-104

Persons engaged in the business of towing and storing motor vehicles may charge a storage fee for a period exceeding twenty-one (21) days if the last known registered owner of the motor vehicle and all lienholders of record are notified by registered mail, return receipt requested, of intent to charge a storage fee for a period to exceed twenty-one (21) days. This notice shall be given at least ten (10) days prior to the imposition of any additional storage fee.