California Code, Welfare and Institutions Code - WIC § 5170

When any person is a danger to others, or to himself, or gravely disabled as a result of inebriation, a peace officer, member of the attending staff, as defined by regulation, of an evaluation facility designated by the county, or other person designated by the county may, upon reasonable cause, take, or cause to be taken, the person into civil protective custody and place him in a facility designated by the county and approved by the State Department of Alcohol and Drug Abuse as a facility for 72-hour treatment and evaluation of inebriates.