Rule 903 Subscribing witness' testimony unnecessary The testimony of a subscribing witness is not necessary to authenticate a writing unless required by the laws of the jurisdiction whose laws govern the validity of the writing. Effective: July 1, 1992 History: Enacted 1990 Ky. Acts ch. 88, sec. 64; renumbered (7/1/92) pursuant to 1992 Ky. Acts ch. 324, sec. 34.