(1) The grounds set forth in subdivisions (2), (3), and (6) of section 29-2101 shall be supported by affidavits showing the truth of such grounds, and the grounds may be controverted by affidavits. The ground set forth in subdivision (5) of section 29-2101 shall be supported by evidence of the truth of the ground in the form of affidavits, depositions, or oral testimony.

(2) If the motion for new trial and supporting documents fail to set forth sufficient facts, the court may, on its own motion, dismiss the motion without a hearing. If the motion for new trial and supporting documents set forth facts which, if true, would materially affect the substantial rights of the defendant, the court shall cause notice of the motion to be served on the prosecuting attorney, grant a hearing on the motion, and determine the issues and make findings of fact and conclusions of law with respect thereto.

(3) In considering a motion for new trial based on the grounds set forth in subdivision (5) of section 29-2101, if the court finds that there is evidence materially affecting the substantial rights of the defendant which he or she could not with reasonable diligence have discovered and produced at trial, the court may, upon the motion of any party and following a hearing, vacate and set aside the judgment and release the person from custody or grant a new trial as appropriate.