Rule 804. Hearsay Exceptions: Declarant Unavailable

(a) Definition of unavailability. ''Unavailability as a witness'' includes situations in which the declarant—

(1) is exempted by ruling of the court on the ground of privilege from testifying concerning the subject matter of his statement; or

(2) persists in refusing to testify concerning the subject matter of his statement despite an order of the court to do so; or

(3) testifies to a lack of memory of the subject matter of his statement; or

(4) is unable to be present or to testify at the hearing because of death or then existing physical or mental illness or infirmity; or

(5) is absent from the hearing and the proponent of his statement has been unable to procure his attendance (or in the case of a hearsay exception under subdivision (b)(3) or (4) his attendance or testimony) by process or other reasonable means. A declarant is not unavailable as a witness if his exemption, refusal, claim of lack of memory, inability, or absence is due to the procurement or wrongdoing of the proponent of his statement for the purpose of preventing the witness from attending or testifying.

(b) Hearsay exceptions. The following are not excluded by the hearsay rule if the declarant is unavailable as a witness:

(1) Former testimony. Testimony given as a witness at another hearing of the same or a different proceeding, or in a deposition taken in compliance with law in the course of the same or another proceeding, if the party against whom the testimony is now offered, or, in a civil action or proceeding, a predecessor in interest, had an opportunity and similar motive to develop the testimony by direct, cross, or redirect examination.