Wash. Rev. Code » Washington Court Rules / Rules of Evidence (ER) / Title 7 Opinions and Expert Testimony
Revised Code of Washington

Wash. R. Evid. 705 (2026)

ER 705. Disclosure of Facts or Data Underlying Expert Opinion

✓ current as of May 2026
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ER 705 DISCLOSURE OF FACTS OR DATA UNDERLYING EXPERT OPINION

The expert may testify in terms of opinion or inference and give reasons therefor without prior disclosure of the underlying facts or data, unless the judge requires otherwise. The expert may in any event be required to disclose the underlying facts or data on cross examination.

[Amended effective September 1, 1992.]

Comment 705

[Deleted effective September 1, 2006.]