Tenn. Code Ann. § 7-58-105

Wherever the location of processing plants shall require local governments to haul solid wastes across state lines, such out-of-state hauling is hereby declared to be authorized and to be a valid exercise of the authority of the local governments involved, and likewise solid wastes from out-of-state may be brought into the state of Tennessee for processing in approved systems, such inbound solid waste to be subject to the same handling standards and regulations as solid waste produced within the state.