California Code, Welfare and Institutions Code - WIC § 6007

(a) Any person detained pursuant to this section shall be evaluated by the facility designated by the county and approved by the State Department of Health Care Services pursuant to Section 5150 as a facility for 72-hour treatment and evaluation.  The evaluation shall be made at the request of the person in charge of the private institution in which the person is detained or by one of the physicians who signed the certificate.  If in the opinion of the professional person in charge of the evaluation and treatment facility or his or her designee, the evaluation of the person can be made by the professional person or his or her designee at the private institution in which the person is detained, the person shall not be required to be evaluated at the evaluation and treatment facility, but shall be evaluated at the private institution to determine if the person is a danger to others, himself or herself, or gravely disabled as a result of mental disorder.

(b) Any person evaluated under this section shall be released from the private institution immediately upon completion of the evaluation if in the opinion of the professional person in charge of the evaluation and treatment facility, or his or her designee, the person evaluated is not a danger to others, or to himself or herself, or gravely disabled as a result of mental disorder, unless the person agrees voluntarily to remain in the private institution.

(c) If in the opinion of the professional person in charge of the facility or his or her designee, the person evaluated requires intensive treatment or recommendation for conservatorship, the professional person or his or her designee shall proceed under Article 4 (commencing with Section 5250) of Chapter 2, or under Chapter 3 (commencing with Section 5350), of Part 1 of Division 5.