Tennessee Code Title 2. Elections § 2-10-213

(a)(1) For the purpose of conducting any hearing or audit as provided in this chapter, the registry has the power to administer oaths, to call any party to testify under oath at the hearings, to require the attendance of witnesses, the production of books, records, and papers, and to take the depositions of witnesses.

(2) For purposes of subdivision (a)(1), the registry is authorized to issue a subpoena for any witness or a subpoena duces tecum to compel the production of any books, records or papers. These subpoenas may be served by registered mail, return receipt requested, to the addressee's business mailing address, or by personnel of the registry, or shall be directed for service to the sheriff of the county where the witness resides or is found, or where the person in custody of any books, records, or papers resides or is found.