Tennessee Code Title 7. Consolidated Governments and Local Governmental Functions and Entities § 7-60-208

(a)(1) All moneys of a county derived in furtherance of the purposes of this chapter, except as otherwise authorized or provided in this chapter, shall be deposited as soon as practicable in a separate account or accounts in banks or trust companies doing business in or out of the state.

(2) The moneys in such accounts shall be paid out on checks signed by such officer or employee of the county as the county shall authorize.

(3) All deposits of such moneys shall, if required by the county, be secured by obligations of the United States or of the state or of the county of a market value equal at all times to the amount of the deposit, and all banks and trust companies are authorized to give such security for such deposits.

(4) Notwithstanding this section, a county shall have power to contract with the holders of any of its bonds or notes as to the custody, collection, securing, investment and payment of any moneys of the county derived in furtherance of the purposes of this chapter, and of any moneys held in a trust or otherwise for the payment of bonds or notes, and to carry out such contract.

(5) Moneys held in trust or otherwise for the payment of bonds or notes or in any way to secure bonds or notes and deposits of such moneys may be secured in the same manner as moneys of the county, and all banks and trust companies are authorized to give such security for such deposits.