Tenn. Code § 47-10-120
The information systems council may encourage and promote consistency and interoperability with similar requirements adopted by other governmental agencies of this and other states, and the federal government and nongovernmental persons interacting with governmental agencies of this state. If appropriate, those standards may specify differing levels of standards from which governmental agencies of this state may choose in implementing the most appropriate standard for a particular application. Any deviation from the standards established by the information systems council by a local governmental public official, including, but not limited to, officials of counties, municipalities, utility districts, other local governmental entities and those offices enumerated under § 8-22-101, shall be subject to the approval of the comptroller of the treasury.
T.C.A. § 47-10-120