Tenn. Code Ann. § 40-7-122

In addition to any other fees the sheriff is entitled to demand and receive in accordance with § 8-21-901, a county legislative body may vote to impose an additional fee of not more than ten dollars ($10.00) for the booking and processing of each person subject to arrest or summons. The fee shall be collected at the same time and in the same manner as other fees are collected by a sheriff in accordance with title 8, chapter 21, part 9. The fee shall not be charged to any person determined by the court to be indigent.