Tennessee Code Title 40. Criminal Procedure § 40-4-102

(a) The grand jury shall make an investigation as to the offense charged in a warrant to have been committed, to the end that it may return an indictment or presentment, as prescribed and required by law for the charged offense.

(b) If an indictment or presentment is found against the defendant, the defendant shall then be proceeded with as now required by law in those cases.

(c) If no indictment or presentment is found, the defendant shall be discharged.

(d) The grand jury shall, immediately upon the receipt of the papers in the case, proceed to an investigation, and those cases shall have preference in the order presented over all other cases to be investigated by the grand jury.