unavailability
unavailability n. 不可获得；不能得到 在证据法上，如有理由表明某证人或其证言是不可获得的，那么该证人先前提供的证言，如可被如实地复述出来，则可作为传闻规则的例外而被采纳。属于证人不可获得的情形包括该证人死亡、精神失常、位于法院传票所能送达的范围之外，或证人就需作证的内容依法庭规则享有免于提供证言的特权等。
UNAVAILABILITY
unavailability
unavailability, n. The status or condition of not being available, as when a witness is exempted by court order from testifying. • Unavailability is recognized under the Federal Rules of Evidence as an exclusion to the hearsay rule. Fed. R. Evid. 804. [Cases: Criminal Law 419(5); Evidence 317(17). C.J.S. Criminal Law § 860; Evidence §§