2007 ORS § 40.315¹
Rule 602. Lack of personal knowledge

Subject to the provisions of ORS 40.415 (Rule 703. Bases of opinion testimony by experts), a witness may not testify to a matter unless evidence is introduced sufficient to support a finding that the witness has personal knowledge of the matter. Evidence to prove personal knowledge may, but need not, consist of the testimony of the witness. [1981 c.892 §44]