Statements exempted from the hearsay rule are not made inadmissible by the hearsay rule even when such statements are offered to prove the truth of the matter asserted and even when such statements thus otherwise satisfy the definition of hearsay provided by Federal Rules of Evidence 801(a) and 801(c) or by similar State rules.

Delaware v. Van Arsdall, 475 U.S. 673, 681 (1986) ("The harmless-error doctrine recognizes the principle that the central purpose of a criminal trial is to decide the factual question of the defendant's guilt or innocence, United States v. Nobles, 422 U.S. 225, 230, 95 S.Ct. 2160, 2166, 45 L.Ed.2d 141...The determination of facts and the accurate determination of facts are important purposes of the process of proof and the law of evidence in America.

United States v. Flecha-Maldonado, 373 F.3d 170, 178-179 (1st Cir. 2004) (upholding trial court's admission of witness's testimony about defendant's prior criminal acts because such evidence constituted "important background information that explained how the government came to suspect the...A person's other crimes, wrongs, or acts are not barred by the character rule either if they are not offered to show that person's propensity or if they are not offered to show that that person engaged in conduct on a particular occasion because of his or her propensity to engage in that sort of conduct.

Fed. R. Evid. 803(6) ("Records of regularly conducted activity. A memorandum, report, record, or data compilation, in any form, of acts, events, conditions, opinions, or diagnoses, made at or near the time by, or from information transmitted by, a person with knowledge, if kept in the course of a regularly conducted business activity, and...There is a hearsay exception for a memorandum, report, record, or data compilation, in any form, of acts, events, conditions, opinions, or diagnoses, made at or near the time by, or from information transmitted by, a person with knowledge, if kept in the course of a regularly conducted activity of a business, institution, association, profession, occupation, or calling if it was the regular practice of that business, institution, association, profession, occupation, or calling to make the memorandum, report, record or data compilation, unless the source of information or the method or circumstances of preparation indicate lack of trustworthiness.