CALIFORNIA EVIDENCE: CIVIL AND CRIMINAL
...Hearsay Except. Requiring Unavail
......Exception: Decl. Against Interest
.........Types of Interests: Penal
............Knowledge of Subject of Statement
2 Cards On This Topic:

Statement against penal interest not inadmissible because of hearsay rule, provided certain conditions met, including declarant had sufficient knowledge of the subject.

Where accomplice inculpates himself and his coD to a fellow inmate/informant, his statements, if trustworthy, are not "testimonial" and are admissible in coD's trial as declarations against penal interest.