Section 643 — Criminal Code: Who shall be the jury

The 12, 13 or 14 jurors who are sworn in accordance with this Part and present at the commencement of the presentation of the evidence on the merits shall be the jury to hear the evidence on the merits. The name of each juror, including alternate jurors, who is sworn shall be kept apart until the juror is excused or the jury gives its verdict or is discharged, at which time the name shall be returned to the box as often as occasion arises, as long as an issue remains to be tried before a jury. The court may try an issue with the same jury in whole or in part that previously tried or was drawn to try another issue, without the jurors being sworn again, but if the prosecutor or the accused objects to any of the jurors or the court excuses any of the jurors, the court shall order those persons to withdraw and shall direct that the required number of cards to make up a full jury be drawn and, subject to the provisions of this Part relating to challenges, orders to excuse and directions to stand by, the persons whose cards are drawn shall be sworn. Failure to comply with the directions of this section or section 631, 635 or 641 does not affect the validity of a proceeding.