A. At any time, for good cause, the presiding judge of the superior court or a designee may excuse a grand juror temporarily or permanently. If a grand juror is excused permanently, the presiding judge of the superior court or a designee may replace the excused juror with an alternate grand juror so as to maintain the original membership at the prescribed number of persons. The alternate grand juror shall be selected as prescribed by chapter 3 of this title.
B. A grand juror shall not vote on any matter on which evidence has been taken in the juror's absence or before the juror's impanelment.