Oregon Revised Statutes Evidence and Witnesses § 41.660

Whenever an object, cognizable by the senses, has such a relation to the fact in dispute as to afford reasonable grounds of belief respecting it, or to make an item in the sum of the evidence, the object may be exhibited to the jury, or its existence, situation and character may be proved by witnesses. The exhibition of the object to the jury shall be regulated by the sound discretion of the court.