Cal. Welf. and Inst. Code § 5230
If, upon evaluation, the person is found to be in need of treatment because he is, as a result of impairment by chronic alcoholism or the use of narcotics or restricted dangerous drugs, a danger to others, or to himself, or is gravely disabled, he may be detained for treatment in a facility for 72-hour treatment and evaluation. Except as provided in this section, he shall in no event be detained longer than 72 hours from the time of evaluation or detention for evaluation, excluding Saturdays, Sundays and holidays if treatment services are not available on those days.
Persons who have been detained for evaluation and treatment shall be released if the criminal charge has been dismissed; released to the custody of the sheriff or continue to be detained pursuant to court order under Section 5226.1; referred for further care and treatment on a voluntary basis, subject to the disposition of the criminal action; certified for intensive treatment; or recommended for conservatorship pursuant to this part, subject to the disposition of the criminal charge; as required.
Ca. Welf. and Inst. Code § 5230