Tennessee Code Title 62. Professions, Businesses and Trades § 62-26-224

(a) The division of investigation is designated the official investigative arm of the commissioner.

(b) Licensees are required to provide the investigative staff all records kept within the normal course of business, as they directly pertain to the exact nature of the complaint under investigation.

(c) The commissioner is granted authority to subpoena to deposition those persons or documents necessary to any investigation undertaken under this part; provided, that all other means, including, but not limited to, notification by return receipt registered United States mail, have been exhausted and have not produced the desired results.