Tennessee Code Title 9. Public Finances § 9-4-302

(a) No department, officer or agency of state government, except the state treasurer, shall deposit state funds to the credit of such department, officer or agency in any financial institution except as provided in this section.

(b) Whenever the satisfactory conduct of the state's business clearly demands it, and not otherwise, the commissioner of finance and administration, with the approval of the governor and the state treasurer, may authorize establishment of an account in the name of a state department or agency in a state depository.

(c) Whenever state officials are required to hold funds in trust as a result of their official duties, such funds may be held in departmental accounts, unless otherwise directed by the commissioner of finance and administration, the governor and the state treasurer.

(d) Whenever a departmental account is established, unless otherwise provided, funds in the account shall be invested in accordance with § 9-4-602.

(e) A petty cash account may be allowed by the commissioner of finance and administration to each state department, institution or agency, which shall in the opinion of the commissioner require such account; and such account so established shall be reimbursed only upon statements and bills audited by the department of finance and administration. In the event that a petty cash account requires the establishment of a separate account in a financial institution, such account shall be established in accordance with subsection (b).

(f) The commissioner of finance and administration shall promptly notify the comptroller of the treasury of any accounts established pursuant to this section.