(a) Filing of a petition under paragraph (1) of subsection (a) of Code Section 37-4-40.3 shall authorize continued admission of the client named in the petition pending completion of a full and fair hearing under Code Section 37-4-40.5.

(b) Within five days, Saturdays, Sundays, and holidays excluded, after a petition is filed authorizing the continued admission of a client under subsection (a) of this Code section, the staff of the facility in which the client is admitted and the representatives of the appropriate community mental retardation program in the client's community shall:

(1) Conduct a comprehensive evaluation of the client;

(2) Jointly develop an individualized program plan for the client; and

(3) File a copy of the evaluation and plan with the court petitioned for a hearing under paragraph (1) of subsection (a) of Code Section 37-4-40.3.