Section 42-5-201 - Joint operations authorized(a) As used in this part, unless the context otherwise requires: (1) "Governing body" means the governing body of a county or municipality and the head of the agency if the public agency is other than a county or municipality; and(2) "Public agency" includes a municipality, as defined in this chapter, any agency of the state government and of the United States, and any municipality, political subdivision and agency of another state.(b) All powers, privileges and authority granted to any municipality by this chapter may be exercised and enjoyed jointly with any public agency of this state, and jointly with any public agency of any other state or of the United States to the extent that the laws of the other state or of the United States permit such joint exercise or enjoyment.(c) If not otherwise authorized by law, any agency of the state government, when acting jointly with any municipality, may exercise and enjoy all of the powers, privileges and authority conferred by this chapter upon a municipality.Acts 1957, ch. 375, § 16; T.C.A., § 42-321.