CA Welf & Inst Code Section 5150
(a)
When a person, as a result of a mental health disorder, is a danger to others, or to himself or herself, or gravely disabled, 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 mobile crisis team, or professional person designated by the county may, upon probable cause, take, or cause to be taken, the person into custody for a period of up to 72 hours for assessment, evaluation, and crisis intervention, or placement for evaluation and treatment in a facility designated by the county for evaluation and treatment and approved by the State Department of Health Care Services. At a minimum, assessment, as defined in Section 5150.4, and evaluation, as defined in subdivision (a) of Section 5008, shall be conducted and provided on an ongoing basis. Crisis intervention, as defined in subdivision (e) of Section 5008, may be provided concurrently with assessment, evaluation, or any other service.
(b)
When determining if a person should be taken into custody pursuant to subdivision (a), the individual making that determination shall apply the provisions of Section 5150.05, and shall not be limited to consideration of the danger of imminent harm.
(c)
The professional person in charge of a facility designated by the county for evaluation and treatment, member of the attending staff, or professional person designated by the county shall assess the person to determine whether he or she can be properly served without being detained. If, in the judgment of the professional person in charge of the facility designated by the county for evaluation and treatment, member of the attending staff, or professional person designated by the county, the person can be properly served without being detained, he or she shall be provided evaluation, crisis intervention, or other inpatient or outpatient services on a voluntary basis. Nothing in this subdivision shall be interpreted to prevent a peace officer from delivering individuals to a designated facility for assessment under this section. Furthermore, the assessment requirement of this subdivision shall not be interpreted to require peace officers to perform any additional duties other than those specified in Sections 5150.1 and 5150.2.