Cal. Evidence Code § 1414 : California Evidence Code — Writings — Authentication And Proof Of Writings — Means Of Authenticating And Proving Writings — Admissions of authenticity Date: 31 Aug 2016 TEXT PDF Current through the 2016 Legislative Session A writing may be authenticated by evidence that: (a) The party against whom it is offered has at any time admitted its authenticity; or (b) The writing has been acted upon as authentic by the party against whom it is offered. Ca. Evid. Code § 1414