Section 1878.

Cal. Code of Civil Procedure - CCP § 1878.
in effect
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A witness is a person whose declaration under oath is received as evidence for any purpose, whether such declaration be made on oral examination, or by deposition or affidavit.
Source: CA Legislative Counsel Bulk DataURL: https://downloads.leginfo.legislature.ca.gov/pubinfo_2025.zipFetched: 6/27/2026

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