Cal. Evid. Code § 1157.6
Neither the proceedings nor the records of a committee established in compliance with Sections 4070 and 5624 of the Welfare and Institutions Code having the responsibility of evaluation and improvement of the quality of mental health care rendered in county operated and contracted mental health facilities shall be subject to discovery. Except as provided in this section, no person in attendance at a meeting of any such committee shall be required to testify as to what transpired thereat. The prohibition relating to discovery or testimony shall not apply to the statements made by any person in attendance at such a meeting who is a party to an action or proceeding the subject matter of which was reviewed at such meeting, or to any person requesting facility staff privileges.
Ca. Evid. Code § 1157.6