A duplicate of an original is admissible to the same extent as the original if (1) there is no genuine question about the authenticity of the original, and (2) admission of the duplicate in lieu of the original is not unfair.

Cf. United States v. Summers, 414 F.3d 1287, pin? (10th Cir. 2005) (footnotes ompitted: "We have repeatedly iterated that a conviction cannot be sustained if obtained by '"piling inference on inference."' Dunmire, 403 F.3d at....Inferences based on inferences are permissible

United States v. Malpica-Garcia, 489 F.3d 393, 396 (1st Cir. 2007) (upholding trial court's admission of testimony given by government witness which did not violate defendant's rights under the Confrontation Clause because....The Sixth Amendment Confrontation Clause places no limits on the admission at trial of nonhearsay statements made prior to or outside of trial.

Fed. R. Evid. 804(a)(4) (declarant "unable to be present or to testify at the hearing because of death or then existing physical or mental illness or infirmity").For purposes of the hearsay exceptions created by Federal Rule of Evidence 804 or a comparable State rule a declarant is "unavailable" within the meaning of Rule 804(b) or a comparable State rule if the declarant is unable to be present or to testify at the hearing because of death or then existing physical or mental illness or infirmity; but a declarant is not "unavailable" if the declarant's absence is due to the procurement or wrongdoing of the proponent of a statement for the purpose of preventing the witness from attending or testifying.