Ind. Code § 6-9-10-2
(f) Each board member, before entering his duties, shall take an oath of office in the usual form, to be indorsed upon his certificate of appointment, which shall be promptly filed with the clerk of the circuit court of his county of residence.
As added by Acts 1980, P.L.64, SEC.1. Amended by P.L.81-1985, SEC.4.