Cal. WIC § 5008.2

(a) When applying the definition of mental disorder for the purposes of Articles 2 (commencing with Section 5200), 4 (commencing with Section 5250), and 5 (commencing with Section 5275) of Chapter 2 and Chapter 3 (commencing with Section 5350), the historical course of the person’s mental disorder, as determined by available relevant information about the course of the person’s mental disorder, shall be considered when it has a direct bearing on the determination of whether the person is a danger to others, or to himself or herself, or is gravely disabled, as a result of a mental disorder. The historical course shall include, but is not limited to, evidence presented by persons who have provided, or are providing, mental health or related support services to the patient, the patient’s medical records as presented to the court, including psychiatric records, or evidence voluntarily presented by family members, the patient, or any other person designated by the patient. Facilities shall make every reasonable effort to make information provided by the patient’s family available to the court. The hearing officer, court, or jury shall exclude from consideration evidence it determines to be irrelevant because of remoteness of time or dissimilarity of circumstances.

(b) This section shall not be applied to limit the application of Section 5328 or to limit existing rights of a patient to respond to evidence presented to the court.