Cal. Welf. and Inst. Code § 5352
When the professional person in charge of an agency providing comprehensive evaluation or a facility providing intensive treatment determines that a person in his or her care is gravely disabled as a result of mental disorder or impairment by chronic alcoholism and is unwilling to accept, or incapable of accepting, treatment voluntarily, he or she may recommend conservatorship to the officer providing conservatorship investigation of the county of residence of the person prior to his or her admission as a patient in such facility.
The professional person in charge of an agency providing comprehensive evaluation or a facility providing intensive treatment, or the professional person in charge of providing mental health treatment at a county jail, or his or her designee, may recommend conservatorship for a person without the person being an inpatient in a facility providing comprehensive evaluation or intensive treatment, if both of the following conditions are met:
If the officer providing conservatorship investigation concurs with the recommendation, he or she shall petition the superior court in the county of residence of the patient to establish conservatorship.
Where temporary conservatorship is indicated, the fact shall be alternatively pleaded in the petition. The officer providing conservatorship investigation or other county officer or employee designated by the county shall act as the temporary conservator.
Ca. Welf. and Inst. Code § 5352