Code of Organization and Civil Procedure (Cap. 12), article 653

653. A referee may be challenged for good cause at any time until he has filed his report, provided the party making the challenge declares upon oath that he was not aware of such cause at the time of the appointment, and that he never appeared before the referee, nor performed any act bef ore him, from the time when h e CODE OF ORGANIZATION AND CIVIL PROCEDURE [CAP. 12. 185 became aware of such cause. Mode of making challenges for cause.