Tenn. Code Ann. § 41-2-142: Furlough program

(a) All counties in the state having duly adopted a consolidated or metropolitan form of government pursuant to title 7, chapter 1 shall institute a furlough program for workhouse prisoners.

(b) All counties having a population of six hundred thousand (600,000) or more, according to the 1970 federal census or any subsequent federal census, shall institute a furlough program for county jail or workhouse prisoners.