Tennessee Code Title 49. Education § 49-13-117

(b)(1) The years of service acquired by a teacher while on a leave of absence to teach at a public charter school shall be used by the local board to obtain or determine tenure status; provided, that when the teacher returns to the traditional LEA from the charter school, the teacher receives two (2) consecutive years of evaluations demonstrating an overall performance effectiveness level of “above expectations” or “significantly above expectations” as required by § 49-5-504.

(2) If a teacher does not receive two (2) consecutive years of evaluations demonstrating an overall performance effectiveness level of “above expectations” or “significantly above expectations” pursuant to subdivision (b)(1), then the time the teacher was on leave of absence to teach at the public charter school shall not be used by the local board to determine tenure status of the teacher.