Tenn. Code Ann. § 8-47-105: Testimony before prosecuting attorneys

Each witness shall be sworn true answers to make to all questions propounded to the witness, touching the matter under investigation, and the testimony of each witness shall be reduced to writing and be signed by the witness. The attorney general and reporter, the district attorneys general, county attorneys, and city attorneys are hereby authorized and empowered to administer the necessary oaths and affirmations to such witnesses.