Oregon Revised Statutes Evidence and Witnesses § 40.170

(a) Evidence of a pertinent trait of character offered by an accused, or by the prosecution to rebut the same;

(b) Evidence of a pertinent trait of character of the victim of the crime offered by an accused, or by the prosecution to rebut the same or evidence of a character trait of peacefulness of the victim offered by the prosecution to rebut evidence that the victim was the first aggressor;

(c) Evidence of the character of a witness, as provided in ORS 40.345 to 40.355; or

(d) Evidence of the character of a party for violent behavior offered in a civil assault and battery case when self-defense is pleaded and there is evidence to support such defense.

(a) ORS 40.180, 40.185, 40.190, 40.195, 40.200, 40.205, 40.210 and, to the extent required by the United States Constitution or the Oregon Constitution, ORS 40.160;

(b) The rules of evidence relating to privilege and hearsay;

(c) The Oregon Constitution; and

(d) The United States Constitution.