California Code, Welfare and Institutions Code - WIC § 5256.5

If at the conclusion of the certification review hearing the person conducting the hearing finds that there is not probable cause to believe that the person certified is, as a result of a mental disorder or impairment by chronic alcoholism, a danger to others, or to himself or herself, or gravely disabled, then the person certified may no longer be involuntarily detained.  Nothing herein shall prohibit the person from remaining at the facility on a voluntary basis or the facility from providing the person with appropriate referral information concerning mental health services.