Cal. Welf. and Inst. Code § 5172
Each person admitted to a facility for 72-hour treatment and evaluation under the provisions of this article shall receive an evaluation as soon after he or she is admitted as possible and shall receive whatever treatment and care his or her condition requires for the full period that he or she is held. The person shall be released before 72 hours have elapsed only if, the psychiatrist directly responsible for the person's treatment believes, as a result of his or her personal observations, that the person no longer requires evaluation or treatment. If any other professional person who is authorized to release the person, believes the person should be released before 72 hours have elapsed, and the psychiatrist directly responsible for the person's treatment objects, the matter shall be referred to the medical director of the facility for the final decision. However, if the medical director is not a psychiatrist, he or she shall appoint a designee who is a psychiatrist. If the matter is referred, the person shall be released before 72 hours have elapsed only if the psychiatrist making the final decision believes, as a result of his or her personal observations, that the person no longer requires evaluation or treatment.
Persons who have been detained for evaluation and treatment shall be released, referred for further care and treatment on a voluntary basis, or, if the person, as a result of impairment by chronic alcoholism, is a danger to others or to himself or herself, or gravely disabled, he or she may be certified for intensive treatment, or a conservator or temporary conservator shall be appointed for him or her pursuant to this part as required.
Ca. Welf. and Inst. Code § 5172