(1) Declarant unavailable
(2) A statement
(3) against proprietary, pecuniary or penal interest - Cost 'em money, property or jail time!
If Declarant's statement was against penal interest, and offered to exculpate accused, unless there is corroboration to show trustworthiness, it is NOT admissible
Example. A defense witness testifies that Declarant told her, "I did it, not Defendant."
If Declarant's statement was against penal interest, and offered to inculpate accused, it is NOT admissible in hearsay form because of the Confrontation Clause. (Of course, Declarant could testify to the fact that D did it!)