Cal. Evidence Code § 1420 : California Evidence Code — Writings — Authentication And Proof Of Writings — Means Of Authenticating And Proving Writings — Response to communications Date: 31 Aug 2016 TEXT PDF Current through the 2016 Legislative Session A writing may be authenticated by evidence that the writing was received in response to a communication sent to the person who is claimed by the proponent of the evidence to be the author of the writing. Ca. Evid. Code § 1420