Expert Witnesses in Oregon
In Oregon, an expert witness is any qualified individual with specialized knowledge whose opinion can assist the jury—whether based on formal training or practical experience.
Rules Governing Disclosure
Expert disclosure in Oregon is governed primarily by ORCP 36. There is no standalone, detailed expert disclosure rule like Federal Rule 26(a)(2).
Parties may obtain information about the following:
Name of the expert
Subject matter of testimony
General substance of opinions
Facts/data the expert relies on
The expert’s qualifications and experience
Compensation to be paid for the study and testimony
ORCP 46 imposes sanctions for failing to provide information about expert witnesses and their testimony.
Admissibility Standards
Expert testimony in Oregon is governed primarily by the Oregon Evidence Code, especially OEC 702, and reflects a flexible, relevance-driven approach rather than a strict Daubert regime.
Although Oregon does not strictly follow Daubert, courts consider several factors to ensure scientific validity, including:
General acceptance in the field
Use of objective, verifiable standards
Known or potential error rates
Existence of specialized literature
Novelty of the technique
Extent of subjective interpretation
Attorney–Expert Communication Protection
Oregon broadly protects attorney–expert communications as work product, but materials, facts, and assumptions that shape a testifying expert’s opinion remain discoverable on a case-by-case basis. Attorneys should exercise caution when sharing sensitive material because Oregon has not adopted the 2010 federal amendments to Rule 26.
Compensation
In Oregon, expert witnesses are entitled to reasonable compensation, which is discoverable for testifying experts and scrutinized for bias, while contingency-based payments are prohibited.
Limits on Number of Expert Witnesses
Oregon imposes no fixed limit on expert witnesses, but courts may restrict cumulative or unnecessary expert testimony to ensure efficient and fair proceedings.
Out-of-State Expert Qualification
Oregon does not impose any residency or in-state licensing requirement for expert witnesses—out-of-state experts are admissible if qualified, though familiarity with applicable standards may affect credibility.
