Or. Rev. Stat. § 40.425 (2026)

      40.425 Rule 705. Disclosure of fact or data underlying expert opinion. An expert may testify in terms of opinion or inference and give reasons therefor without prior disclosure of the underlying facts or data, unless the court requires otherwise. The expert may in any event be required to disclose the underlying facts or data on cross-examination. [1981 c.892 §61]