Section 329(3) in Bharatiya Nagarik Suraksha Sanhita, 2023
(3)Where any such expert is summoned by a Court, and he is unable to attend personally, he may, unless the Court has expressly directed him to appear personally, depute any responsible officer working with him to attend the Court, if such officer is conversant with the facts of the case and can satisfactorily depose in Court on his behalf.