Montana Title 46. Criminal Procedure § 46-11-302. Challenges to grand jury or grand jurors

(1) The prosecutor may challenge the panel of a grand jury on the ground that the grand jury was not selected, drawn, or summoned according to law and may challenge an individual juror on the ground that the juror is not legally qualified. Challenges must be made before the administration of the oath of the jurors, may be oral or in writing, and must be tried and decided by the court.

(2) At any time for cause shown, the district court may excuse or discharge a juror either temporarily or permanently, and in the latter event, the court may impanel another person in place of the juror discharged.

(3) A motion to dismiss the indictment may be based on the ground that the grand jury was not selected, drawn, or summoned according to law or that an individual juror was not legally qualified. An indictment may not be dismissed on the ground that one or more members are not legally qualified if it appears from the record kept pursuant to this part that eight or more jurors, after deducting those not legally qualified, concurred in finding the indictment.