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§ 2034.415.Production of materials

Title 4. Civil Discovery Act · Chapter 18. Simultaneous Exchange of Expert Witness Information · Article 3. Deposition of Expert Witness · Enacted 2016 · no amendments on record · Last verified July 29, 2026

In one sentenceSection 2034.415 requires a retained expert witness whose deposition is noticed under Section 2025.220 to produce, no later than three business days before the deposition, any materials or category of materials called for by the deposition notice, including electronically stored information.

Full Text of § 2034.415

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An expert described in subdivision (b) of Section 2034.210 whose deposition is noticed pursuant to Section 2025.220 shall, no later than three business days before his or her deposition, produce any materials or category of materials, including any electronically stored information, called for by the deposition notice.

Plain-English Summary

This section fills a timing gap that used to let document production drag out to the day of an expert's deposition, leaving the deposing party no chance to review the material beforehand. It applies to the kind of retained expert described in Section 2034.210, an expert who has prepared, or is expected to prepare, a written report and whose deposition notice, issued under Section 2025.220, calls for the production of documents or other materials.

Under this section, that production cannot wait until the deposition begins. The expert must produce whatever materials or category of materials the notice calls for, including electronically stored information, no later than three business days before the deposition date. That advance window gives the deposing attorney time to review the file, spreadsheets, underlying data, or other backup an expert relied on, rather than confronting it cold at the deposition table and having to adjourn to absorb it.

Frequently Asked Questions

Which experts does this three-day production rule apply to?

An expert described in Section 2034.210(b), whose deposition is noticed under Section 2025.220 with a request for documents or other materials.

How far in advance of the deposition must the materials be produced?

No later than three business days before the deposition.

Does this section cover electronically stored information?

Yes. The materials to be produced include any electronically stored information called for by the deposition notice, not just paper documents.

Why does early production matter for an expert deposition?

It gives the deposing party time to review the expert's underlying materials before questioning begins, rather than seeing them for the first time at the deposition itself.

Amendment History

(Added by Stats.2016, c. 467 (A.B.2427), § 3, eff. Jan. 1, 2017.)

Source & verification. Section text is reproduced verbatim from the West's Annotated California Codes / Thomson Reuters. Enacted by the California Legislature. Last verified July 29, 2026. · Official source
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