Tennessee Code Title 20. Civil Procedure § 20-18-101

(1) Challenges the constitutionality of:

(2) Includes a claim for declaratory judgment or injunctive relief; and

(3) Is brought against the state, a state department or agency, or a state official acting in their official capacity.

(b)(1) When an action described in subsection (a) is filed, the person or entity filing the action shall provide notice of the complaint to the presiding judge of the judicial district, who shall notify the supreme court. The supreme court shall select two (2) trial court judges of courts of record to sit with the judge to whom the civil action was originally assigned as a three-judge panel to hear and decide the civil action.

(2) To ensure that members of the three-judge panel are drawn from different regions of the state, the supreme court shall select one (1) judge from each grand division of the state other than the grand division in which the civil action was originally filed.

(3) The supreme court shall designate one (1) member of the panel to serve as the chief judge.

(4) Should any member of the three-judge panel be disqualified or otherwise unable to serve on the panel, the supreme court shall appoint as a replacement another trial court judge from the same grand division as the judge being replaced, who shall serve by interchange, as provided in Rules 10B and 11 of the Tennessee Supreme Court Rules.

(5) In the event of a disagreement among the three (3) judges comprising the panel, the majority prevails.

(6) The rules promulgated by the supreme court shall govern the practice and procedure of the three-judge panel including what procedural matters may be decided solely by the chief judge.