Expert, scientific, or specialized evidence satisfies the requirements under Federal Rule of Evidence 702 or similar rules for the admissibility of expert, scientific, or specialized evidence, only if the expert, scientific, or specialized field or method is shown to be reliable. "Reliability" for this purpose is more than bare relevance but the expert evidence does not have to satisfy the burden of proof applicable to the fact for which the expert, scientific, or specialized evidence is offered.

United States v. Archer, 843 F.2d 1019, 1023 (7th Cir. 1988) (upholding trial court's ruling which allowed the government to introduce evidence of accused's involvement in prior escape plans because such evidence demonstrated that accused "had a profound awareness of security measures and various escape...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. 404(a)(1) ("In a criminal case, evidence of a pertinent trait of character offered ... by the prosecution to rebut" evidence of a pertinent trait of character offered by an accused is admissible).If a criminal defendant offers evidence of his or her character circumstantially - to show he or she did not commit the crime charged -- the prosecution can offer rebutting evidence of defendant's character.

United States v. Mussacre, 405 F.3d 161, 168-169 (3d Cir. 2005) (upholding trial court's admission of witnesses' testimony about Bruce's inculpatory statements under Federal Rules of Evidence 804(b)(3) because (1)....A statement qualifies as a statement against interest for purposes of the hearsay exception for statements against interest only if the statement, at the time the declarant made it, was so contrary to the declarant's interest that a reasonable person in the declarant's position would not have made if the declarant had believed the statement to be untrue.