Tenn. Code Ann. § 57-3-410

To the end that this chapter may be better enforced, the grand juries of this state shall have and are clothed with inquisitorial power to inquire into and ascertain whether or not there has been any violation of this chapter, and to return indictments in proper cases. It shall be the duty of all circuit and criminal court judges to give this law in their charges to the grand juries of the state, and all sheriffs and other peace officers charged with the enforcement of the laws of the state are also required to enforce this chapter.