(a) The voters of the 51st Judicial District elect a district attorney who represents the state in all criminal and habeas corpus cases in that district court.
(b) The district attorney of the 51st Judicial District may request the district attorney of the 119th Judicial District to assist in the trial of a criminal or habeas corpus case in Tom Green County. The district attorney of the 51st Judicial District has absolute control and management of those cases.