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Section 1416 Of Article 2. Means Of Authenticating And Proving Writings From California Evidence Code >> Division 11. >> Chapter 1. >> Article 2.

1416
. A witness who is not otherwise qualified to testify as an expert may state his opinion whether a writing is in the handwriting of a supposed writer if the court finds that he has personal knowledge of the handwriting of the supposed writer. Such personal knowlegde may be acquired from:
  (a) Having seen the supposed writer write;
  (b) Having seen a writing purporting to be in the handwriting of the supposed writer and upon which the supposed writer has acted or been charged;
  (c) Having received letters in the due course of mail purporting to be from the supposed writer in response to letters duly addressed and mailed by him to the supposed writer; or
  (d) Any other means of obtaining personal knowledge of the handwriting of the supposed writer.