Expert disclosure compared: California, Washington and Oregon

Two features distinguish it. First, it does not happen unless a party demands it, which means an exchange can simply not occur in a case where nobody asks. Second, when it does happen both sides disclose at once.

The consequence for expert work is the significant one: there is no opportunity to shape an opinion around the opposing report, because neither side has seen it. An opinion that has not addressed the obvious alternative explanation will meet it for the first time in deposition.

That places weight on completeness at the outset in a way the federal sequence does not. A rebuttal-minded approach — get the core opinion out and deal with the other side's theory later — is a poor fit for California practice.

This is straightforward once understood and a persistent trap when it is not, because there is no general rule to look up. Counsel arriving from a jurisdiction with a fixed statutory sequence may look for one, not find it, and assume disclosure is further away than the order in fact provides.

The instrument also differs from its federal counterpart. A CR 26(b)(5) answer is a different document, at a different level of detail, from a federal expert report — and preparing one where the other is required is a recurring source of avoidable motion practice, particularly in matters that are removed partway through.

The practical effect for expert work is to raise the value of early candour. Where the record will not support the opinion counsel was hoping for, learning that during the assessment stage matters more in Oregon than in a jurisdiction with a fuller pre-trial expert disclosure sequence, because there is less opportunity for the problem to surface and be corrected before testimony.

That is why an Oregon engagement is structured to put the verbal assessment before the written report, and why we say plainly during that assessment where the materials do not support the theory.

Where removal is realistically in prospect, the sensible course is to build the report to the federal obligation from the outset. A Rule 26(a)(2)(B)-grade report is always adequate in state court; the reverse is not true, and rebuilding a report under time pressure after removal is avoidable work.

The admissibility standard changes too — from Sargon, ER 702 with Frye, or the OEC 702 framework to FRE 702 and the Daubert line — which is covered in more detail in the comparison of the four standards.

This site does not state or calculate any deadline, day count, or trigger date, and that is deliberate rather than evasive. Disclosure provisions are amended, orders vary between courts and between departments within the same court, and a general summary that is accurate today is a liability the moment a rule changes.

What is safe to generalise is the shape: California rewards a complete opinion early, Washington rewards reading the order rather than looking for a rule, and Oregon rewards candour at the assessment stage. Those are drafting and sequencing observations, not procedural advice.