Evidence Code – EVID § 1521
EVID § 1521. Secondary Evidence Rule
(1) A genuine dispute exists concerning material terms of the writing and justice requires the exclusion.
(2) Admission of the secondary evidence would be unfair.
(b) Nothing in this section makes admissible oral testimony to prove the content of a writing if the testimony is inadmissible under Section 1523 (oral testimony of the content of a writing).
(c) Nothing in this section excuses compliance with Section 1401 (authentication).
(d) This section shall be known as the “Secondary Evidence Rule.”