Tenn. Code Ann. § 68-131-114

Notwithstanding any provision of this part, or any rule or regulation to the contrary, liquid drain openers containing sulfuric acid and any preparation or product containing sulfuric acid in a concentration of ten percent (10%) or higher intended or packaged in a form suitable for use in households may be sold in this state if the product and packaging conforms to federal law, including, but not limited to, the federal Hazardous Substance Act, compiled in 15 U.S.C. § 1261 et seq., the Poison Prevention Packaging Act, compiled in 15 U.S.C. §§ 1471-1477, and all applicable federal regulations.