Tenn. Code Ann. § 12-9-108: Interlocal contracts for performance of services

Any one (1) or more public agencies may contract with any one (1) or more public agencies to perform any governmental service, activity or undertaking which each public agency entering into the contract is authorized by law to perform; provided, that such contract shall be authorized by the governing body of each party to the contract. Such contract shall set forth fully the purposes, powers, rights, objectives, and responsibilities of the contracting parties. Contracts entered into pursuant to this section need not conform to the requirements set forth in this chapter for contracts for joint undertakings.