Rule 5.606 - Juror's competency as a witnessa. At the trial. A juror may not testify as a witness before the other jurors at the trial. If a juror is called to testify, the court must give a party an opportunity to object outside the jury's presence.b.During an inquiry into the validity of a verdict or indictment.(1) Prohibited testimony or other evidence. During an inquiry into the validity of a verdict or indictment, a juror may not testify about any statement made or incident that occurred during the jury's deliberations; the effect of anything upon that juror's or another juror's vote; or any juror's mental processes concerning the verdict or indictment. The court may not receive a juror's affidavit or evidence of a juror's statement on these matters. (2) Exceptions. A juror may testify about whether:(A) Extraneous prejudicial information was improperly brought to the jury's attention. (B) An outside influence was improperly brought to bear on any juror. (C) A mistake was made in entering the verdict on the verdict form.Report 1983; November 9, 2001, effective February 15, 2002; amended September 28, 2016, effective 1/1/2017.