Tennessee Code Title 62. Professions, Businesses and Trades § 62-35-141

(b)(1) While a full-time sworn peace officer certified pursuant to § 38-8-107 is employed in a jurisdiction other than the full-time sworn peace officer's primary jurisdiction, the officer's clothing shall bear insignia and markings clearly designating that the peace officer is a private duty law enforcement officer.  The Tennessee peace officer standards and training commission, created by title 38, chapter 8, part 1, shall establish design criteria for the insignia and markings.

(2) Notwithstanding subdivision (b)(1), a law enforcement officer may wear the law enforcement officer's jurisdiction's uniform, if the jurisdiction has authorized its officers to do so.