California Code, Evidence Code - EVID § 1156

(a) In-hospital medical or medical-dental staff committees of a licensed hospital may engage in research and medical or dental study for the purpose of reducing morbidity or mortality, and may make findings and recommendations relating to such purpose. Except as provided in subdivision (b), the written records of interviews, reports, statements, or memoranda of such in-hospital medical or medical-dental staff committees relating to such medical or dental studies are subject to Title 4 (commencing with Section 2016.010) of Part 4 of the Code of Civil Procedure (relating to discovery proceedings) but, subject to subdivisions (c) and (d), shall not be admitted as evidence in any action or before any administrative body, agency, or person.

(b) The disclosure, with or without the consent of the patient, of information concerning him to such in-hospital medical or medical-dental staff committee does not make unprivileged any information that would otherwise be privileged under Section 994 or 1014; but, notwithstanding Sections 994 and 1014, such information is subject to discovery under subdivision (a) except that the identity of any patient may not be discovered under subdivision (a) unless the patient consents to such disclosure.

(c) This section does not affect the admissibility in evidence of the original medical or dental records of any patient.

(d) This section does not exclude evidence which is relevant evidence in a criminal action.