(a) A motion for an order of protective custody may be filed only in the court in which an application for court-ordered mental health services is pending.
(b) The motion may be filed by the county or district attorney or on the court's own motion.
(c) The motion must state that:
(1) the judge or county or district attorney has reason to believe and does believe that the proposed patient meets the criteria authorizing the court to order protective custody; and
(2) the belief is derived from:
(A) the representations of a credible person;
(B) the proposed patient's conduct; or
(C) the circumstances under which the proposed patient is found.
(d) The motion must be accompanied by a certificate of medical examination for mental illness prepared by a physician who has examined the proposed patient not earlier than the third day before the day the motion is filed.
(e) The judge of the court in which the application is pending may designate a magistrate to issue protective custody orders, including a magistrate appointed by the judge of another court if the magistrate has at least the qualifications required for a magistrate of the court in which the application is pending. A magistrate's duty under this section is in addition to the magistrate's duties prescribed by other law.