Gujarat High Court Civil Manual (subordinate court practice), 1960
A Court can appoint any one for taking evidence; it is guided in its choice solely by personal qualifications and considerations of convenience and suitability. Except for conventions, Foreign Service Officers may be appointed on the condition that they are allowed to appoint a deputy. The power to do this may be provided for in the writ of commission or order appointing the Foreign Service Officer. The power to appoint a deputy may normally be included in the order of appointment.