Idaho Statutes Title 19. Criminal Procedure § 19-3927. Grounds for new trial

A new trial may be granted in the following cases:

1. When the trial has been had in the absence of the defendant, unless he voluntarily absent himself, with full knowledge that a trial is being had.

2. When the jury has received any evidence out of court.

3. When the jury has separated without leave of the court, after having retired to deliberate upon their verdict, or been guilty of any misconduct tending to prevent a fair and due consideration of the case.

4. When the verdict has been decided by lot, or by any means other than a fair expression of opinion on the part of all the jurors.

5. When there has been error in the decision of the court, given on any question of law arising during the course of the trial.

6. When the verdict is contrary to law or evidence.

7. When new evidence is discovered, material to the defendant, and which he could not, with reasonable diligence, have discovered and produced at the trial; but when a motion for a new trial is made upon this ground the defendant must produce at the hearing the affidavits of the witnesses by whom such newly-discovered evidence is expected to be given.