US lawFederal (United States)Court rulesFederal Rules of Evidence903Fed. R. Evid. 903Rule 903. Subscribing Witness’s TestimonyLast amended: 2011Year: 2025Length: 23 wordsOfficial source A subscribing witness’s testimony is necessary to authenticate a writing only if required by the law of the jurisdiction that governs its validity.PreviousFed. R. Evid. 902NextFed. R. Evid. 1001