5150-When a person, as a result of a mental health disorder, is a danger to others, or to himself, a peace officer, professional person in charge of a facility designated by the county for evaluation and treatment, member of the attending staff, as defined by regulation, of a facility designated by the county for evaluation and treatment, designated members of a crisis team, or professional designated by the county may, upon probable cause, the person into custody for a period of up to 72 hours.