If a pattern of behavior of a natural person does not rise to the status of a habit, it may constitute a character trait and such non-habitual behavior may be barred by the prohibition against circumstantial character evidence.

Fed. R. Evid. 103(a)(1) (statement of the specific ground of the objection necessary "if the specific ground [of the objection] was not apparent from the context").A party objecting to an offer of evidence need not state the ground of its objection if the ground of the objection is already apparent.

United States v. Shaw, 714 F.2d 544, 545 (5th Cir. 1983) (upholding trial court's admission of extraneous evidence of accused's character trait [tendency to violence while intoxicated] where it was offered to show accused's intent and rebut his claim of accident ).Evidence of a criminal or wrongful act apart from the act that at issue at trial Is not barred by the prohibition against circumstantial use of character if intent, knowledge, mistake, or accident is a legally-material factual issue, the opposing party suggests the non-existence of knowledge or urges mistake or accident as a defense, and evidence of another crime, wrong, or act is offered to prove the knowledge or the absence of mistake or accident by a criminal defendant or other person.

United States v. Gettel, 474 F.3d 1081, 1087 (8th Cir. 2007) (upholding trial court's admission into evidence of the stolen rifle and witness's testimony about its origin because such evidence was relevant to prove accused's knowledge that the handgun was strolen, which was a material issue at trial).Evidence of a criminal or wrongful act apart from the act that at issue at trial Is not barred by the prohibition against circumstantial use of character if intent, knowledge, mistake, or accident is a legally-material factual issue, the opposing party suggests the non-existence of knowledge or urges mistake or accident as a defense, and evidence of another crime, wrong, or act is offered to prove the knowledge or the absence of mistake or accident by a criminal defendant or other person.