(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 the declarant’s statement;
(2) persists in refusing to testify concerning the subject matter of the declarant’s statement despite an order of the court to do so;
(3) testifies to a lack of memory of the subject matter of the declarant’s statement;
(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 the declarant’s statement has been unable to procure the declarant’s attendance or testimony by process or other reasonable means.
A declarant is not unavailable as a witness if the declarant’s exemption, refusal, claim of lack of memory, inability, or absence is due to the procurement or wrong-doing of the proponent of the declarant’s statement for the purpose of preventing the witness from attending or testifying.
(b) Hearsay Exceptions. The following are not excluded if the declarant is unavailable as a witness:
(1) Former testimony. In civil cases, testimony given as a witness at another hearing of the same or a different proceeding, or in a deposition taken in the course of another proceeding, if the party against whom the testimony is now offered, or a person with a similar interest, had an opportunity and similar motive to develop the testimony by direct, cross, or redirect examination. In criminal cases, testimony given as a witness at another hearing of the same or a different proceeding, if the party against whom the testimony is now offered had an opportunity and similar motive to develop the testimony by direct, cross, or redirect examination. In criminal cases the use of depositions is controlled by Chapter 39 of the Code of Criminal Procedure.
(2) Dying declarations. A statement made by a declarant while believing that the declarant’s death was imminent, concerning the cause or circumstances of what the declarant believed to be impending death.
(3) Statement of personal or family history.
(A) A statement concerning the declarant’s own birth, adoption, marriage, divorce, legitimacy, relationship by blood, adoption, or marriage, ancestry, or other similar fact of personal or family history even though declarant had no means of acquiring personal knowledge of the matter stated; or
(B) A statement concerning the foregoing matters, and death also, of another person, if the declarant was related to the other by blood, adoption, or marriage or was so intimately associated with the other’s family as to be likely to have accurate information concerning the matter declared.