(1) Any objection to the manner in which a jury panel has been selected or drawn shall be raised by a motion to discharge the jury panel. The motion shall be made at least five days prior to the date set for trial if the names and addresses of the panel members and the grounds for objection thereto are known to the parties or can be learned by an inspection of the records of the clerk of the district court at that time; in other cases the motion must be made prior to the time when the jury is sworn to try the case. For good cause shown, the court may entertain the motion at any time thereafter.

(2) The motion shall be in writing and shall state facts which, if true, show that the jury panel was improperly selected or drawn.

(3) If the motion states facts which, if true, show that the jury panel has been improperly selected or drawn, it shall be the duty of the court to conduct a hearing. The burden of proof shall be on the movant.

(4) If the court finds that the jury panel was improperly selected or drawn, the court shall order the jury panel discharged and the selection or drawing of a new panel in the manner provided by law.