Tenn. Code Ann. § 47-18-613: Liability - Good faith defenses

(a) A lessor is not liable under § 47-18-612 for a violation of this part if the lessor shows by a preponderance of the evidence that the violation was not intentional and resulted from a bona fide error, even though the lessor maintained procedures reasonably adapted to avoid such an error. Examples of a bona fide error include, but are not limited to, clerical, calculation, computer malfunction and programming, and printing errors. An error of legal judgment with respect to requirements of this title is not a bona fide error.

(b) A lessor is not liable under this part for any act done or omitted in good faith in conformity with any rule, regulation, or interpretation promulgated by the attorney general or by an official duly authorized by the attorney general. This rule applies even if, after the act or omission has occurred, the rule, regulation, or interpretation is amended, rescinded, or determined by judicial or other authority to be invalid for any reason.