A juror may not testify about any statement or matter occurring during jury deliberations, or about the mental processes or emotions that may have influenced jurors' votes on the verdict.

United States v. Perlmuter, 693 F.2d 1290, 1294 (9th Cir. 1982) (holding that even though the criminal records was admitted into evidence by the trial court on other grounds, it could not be admitted under the residual....A statement not specifically covered by Federal Rule of Evidence 803 or 804 or by comparable State rules, but having equivalent circumstantial guarantees of trustworthiness, is not excluded by the hearsay rule, if the court determines that (A) the statement is offered as evidence of a material fact; (B) the statement is more probative on the point for which it is offered than any other evidence which the proponent can procure through reasonable efforts; and (C) the general purposes of these rules and the interests of justice will best be served by admission of the statement into evidence.

United States v. Robinson, 482 F.3d 244, 246-247 (3d Cir. 2007) (upholding trial court's ruling which allowed the testimony of a county narcotics task force officer about the admission of several buyers regarding their....The federal constitutional guarantee of due process may limit the government's right to introduce unreliable hearsay evidence against a defendant in a criminal trial.

United States v. Delgado, 401 F.3d 290, 299 (5th Cir. 2005) (upholding trial court's admission of testimony of co-conspirator Michael Martinez which did not violate defendant's rights under the Confrontation Clause....The right of confrontation guaranteed by the Confrontation Clause of the Sixth Amendment to the U.S. Constitution puts no constraints on the admissibility of nontestimonial hearsay statements; the federal constitutional right of confrontation does not apply to such statements.