Tenn. Code § 37-5-112
All current rules, regulations, orders, decisions and policies heretofore issued or promulgated by any departments of state government whose functions have been transferred under this chapter shall remain in full force and effect and shall hereafter be administered and enforced by the department. To this end, the department of children's services, through its commissioner, shall have the authority, consistent with the statutes and regulations pertaining to the programs and functions transferred herein, to modify or rescind orders, rules and regulations, decisions or policies heretofore issued and to adopt, issue or promulgate new orders, rules and regulations, decisions or policies as may be necessary for the administration of the programs or functions herein transferred. The application of rules and regulations and the policies of the department shall be uniform and consistent throughout the state.
T.C.A. § 37-5-112