Tennessee Code Title 68. Health, Safety and Environmental Protection § 68-102-148

(a) It is unlawful for any person, firm, association or corporation to sell, or offer for sale, for use in this state, any device, appliance, system or equipment designed to act as an alarm in the detection and prevention of fires, unless the device, appliance, system or equipment has been investigated and listed by a nationally recognized and approved independent testing agency or laboratory, or agency authorized to make such independent inspections by the state fire marshal.

(b) This section does not apply to any device, appliance, system or equipment referenced in subsection (a) offered by a public utility subject to the jurisdiction of, or regulation by, the Tennessee public utility commission or a comparable federal agency.

(c) A violation of this section is a Class C misdemeanor.