Colo. R. Evid. 606 (2026)

(a) At the trial. A member of the jury may not testify as a witness before that jury in the trial of the case in which the juror is sitting. No objection need be made in order to preserve the point.

(b) Inquiry into validity of verdict or indictment. Upon an inquiry into the validity of a verdict or indictment, a juror may not testify as to any matter or statement occurring during the course of the jury’s deliberations or to the effect of anything upon his or any other juror’s mind or emotions as influencing him to assent to or dissent from the verdict or indictment or concerning his mental processes in connection therewith. But a juror may testify about (1) whether extraneous prejudicial information was improperly brought to the jurors’ attention, (2) whether any outside influence was improperly brought to bear upon any juror, or (3) whether there was a mistake in entering the verdict onto the verdict form. A juror’s affidavit or evidence of any statement by the juror may not be received on a matter about which the juror would be precluded from testifying.

Source: Entire rule amended and effective and committee comment added and effective September 27, 2007.

COMMITTEE COMMENT Rule 606(b) has been amended to bring it ment responded to a divergence between the into conformity with the 2006 amendments to text of the Rule and the case law that had the federal rule, providing that juror testimony established an exception for proof of clerical may be used to prove that the verdict reported errors. See Fed. R. Evid. 606(b) advisory comwas the result of a mistake in entering the ver- mittee notes (2006 Amendments); see also dict on the verdict form. The federal amend- Stewart v. Rice, 47 P.3d 316 (Colo. 2002).