(a) The attorney general shall defend a state district attorney in an action in a federal court if:
(1) the district attorney is a defendant because of the district attorney's office;
(2) the cause of action accrued while the person filing the action was confined in the Texas Department of Criminal Justice;
(3) the district attorney requests the attorney general's assistance in the defense; and
(4) there is no action pending against the district attorney in which the attorney general is required to represent the state.
(b) The attorney general shall defend a state grand juror who is a defendant in an action in any court if:
(1) the suit involves an act of the person while in the performance of duties as a grand juror; and
(2) the person requests the attorney general's assistance in the defense.
(c) The attorney general may defend a state district attorney or a county attorney in an action in a federal court if:
(1) the district or county attorney is a defendant because of the district or county attorney's position;
(2) the cause of action relates to the enforcement of a state statute; and
(3) the district or county attorney requests the attorney general's assistance in the defense.