United States v. Dennis Jamison, 635 F.3d 962

Jamison was convicted of possessing an unregistered firearm (sawed-off shotgun) in violation of 26 U.S.C. §§ 5861(d), 5845(a; firearm length 14 1/2 inches; barrel 8 1/16 inches).
Evidence showed the shotgun was never registered, and Jamison admitted purchasing it years earlier knowing it was illegal due to its short length.
During trial, the government cross-examined Jamison’s wife about her statements and her belief that Jamison was aggressive, including questions on why she thought so.
Wife testified inconsistencies existed between sworn statements to police that the shotgun belonged to Jamison and her trial testimony; she also described Jamison as aggressive.
Nine government witnesses testified, and the shotgun and related facts were admitted into evidence; Jamison’s wife testified to prior statements and the couple’s relationship history.
Jamison argues the cross-examination question was irrelevant, unfairly prejudicial, and improperly prejudicial under Rule 403, but the court affirmed admission and ultimately affirmed the conviction as harmless error.

Issue	Plaintiff's Argument	Defendant's Argument	Held
Admissibility of bias-cross examination question	Jamison argues the question about aggression was irrelevant and prejudicial.	Government contends the question probed bias/motive to lie and was admissible.	District court did not abuse discretion; question deemed probative of bias.
Undue prejudice or cumulative effect under Rule 403	Jamison claims the evidence was unduly cumulative and prejudicial.	Government contends evidence was probative and not substantially outweighed by prejudice.	Evidence not unduly cumulative; probative of bias; no Rule 403 error.
Sufficiency of foundation to ask about aggressiveness	Jamison argues there was insufficient foundation to support the opinion question.	Government asserts sufficient foundation from prior statements and relationship context.	Foundational requirements met; questioning properly supported by evidence.
Harmless error analysis	If error occurred, it could be reversible; prejudicial impact on verdict.	Any error was harmless given overwhelming proof of possession, knowledge, and unregistration.	Any error harmless beyond reasonable doubt; conviction affirmed.

United States v. Abel, 469 U.S. 45 (Supreme Court 1984) (bias evidence generally relevant to credibility)
United States v. Thompson, 359 F.3d 470 (7th Cir. 2004) (cross-examination of bias and credibility; threats context)
United States v. Manske, 186 F.3d 770 (7th Cir. 1999) (bias inquiry and admissibility on cross-examination)
Dudley v. Duckworth, 854 F.2d 967 (7th Cir. 1988) (threat evidence on direct examination; unfair prejudice concern)
United States v. Edwards, 90 F.3d 199 (7th Cir. 1996) (knowledge and features sufficient to prove regulatory understanding)
United States v. Sanders, 520 F.3d 699 (7th Cir. 2008) (knowledge inference from possession and weapon characteristics)
Staples v. United States, 511 U.S. 600 (Supreme Court 1994) (knowledge requirement for possession of regulated firearm features)