Tenn. Code Ann. § 49-5-208

No teacher or other educator shall be discouraged or disciplined by any supervisor, including a principal, the director of schools, or the local board of education, for reporting inaccuracies, errors, or potentially inflammatory material in textbooks and instructional materials or content to a supervisor, an elected official, or a parent or guardian of a student. No teacher or other educator shall be asked or required to waive the right to report inaccuracies, errors, or potentially inflammatory material in textbooks and instructional materials or content to a supervisor, an elected official, or a parent or guardian of a student as a condition of employment or continuing employment.