Tenn. Code § 4-3-2708
All current rules, regulations, orders, decisions and policies heretofore issued or promulgated by an agency of state government whose functions have been transferred under chapter 1100 of the Public Acts of 2010 to the department of intellectual and developmental disabilities shall remain in full force and effect and shall hereafter be administered and enforced by the department of disability and aging. To this end, the department of disability and aging, 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.
T.C.A. § 4-3-2708