Tennessee Code Title 41. Correctional Institutions and Inmates § 41-2-147

(a) The sheriff or administrative authority having responsibility for the custody of any person sentenced to a local jail or workhouse pursuant to former § 40-35-302 [repealed], § 40-35-306 [repealed], § 40-35-307 [repealed] or § 40-35-311 [repealed] or present § 40-35-302, § 40-35-306, § 40-35-307 or § 40-35-314 shall, when a person has become eligible for work related programs pursuant to those sections, be authorized to permit the person to perform any of the duties set out in § 41-2-123 or § 41-2-146.

(b) Work performed by a prisoner under this section shall be credited toward reduction of the prisoner's sentence in the following manner: for each one (1) day worked on such duties by the prisoner the sentence shall be reduced by two (2) days.

(c) Any prisoner receiving sentence credits under this section shall not be eligible for the sentence reduction authorized by § 41-2-111.