Section 404(a) of the Federal Rules of Evidence carefully limits the circumstances under which character evidence may be admitted to prove that an individual, at the time in question, acted in conformity with his character. Rule 404(a) provides: ' (a) Character Evidence Generally. Evidence of a person's character or a trait of his character is not admissible for the purpose of proving that he acted in conformity therewith on a particular occasion, except: (1) Character of accused. Evidence of a pertinent trait of his character offered by an accused, or by the prosecution to rebut the same; (2) Character of victim. Evidence of a pertinent trait of character of the victim of the crime offered by an accused, or by the prosecution to rebut the same, or evidence of a character trait of peacefulness of the victim offered by the prosecution in a homicide case to rebut evidence that the victim was the first aggressor; . . . .'
This rule is necessary because of the high degree of prejudice that inheres in character evidence. See Fed. R. Evid. 404 advisory committee note. In most instances courts are unwilling to permit a jury to infer that an individual ...