is not admissible to prove the character of a person in order to show that he acted in conformity therewith.” To fall within the scope of Rule 404(b), an act need not be criminal, so long as it tends to impugn a defendant’s character. See, United States v. Terebecki, 692 F.2d 1345, 1348 n. 2 (11th Cir.1982). Under Rule 404(b), however, pri- or bad acts are admissible if they are (1) relevant to an issue other than character,3 (2) necessary,4 and (3) reliable. United States v. Greenwood, 796 F.2d 49, 53 (4th Cir.1986); United States v. Echeverri-Jaramillo, 777 F.2d 933, 936 (4th Cir.1985), cert. denied, 475 U.S. 1031, 106 S.Ct. 1237, 89 L.Ed.2d 345 (1986); United States v. Hadaway, 681 F.2d 214, 217 (4th Cir.1982). The prosecution may introduce evidence of prior bad acts to show “proof of motive, opportunity, intent, or absence of mistake or accident.” Rule 404(b). This list, however, is not exhaustive. United States v. Stockton, 788 F.2d 210, 219 n. 15 (4th Cir.1986), cert. denied, — U.S.-, 107 S.Ct. 147, 93 L.Ed.2d 89 (1986).
Even if the evidence is admissible under Rule 404(b), its probative value must be weighed against the danger of undue prejudice aroused by the evidence.
United States v. King, 768 F.2d 586, 588 (4th Cir.1985);
United States v. Johnson, 634 F.2d 735, 737 (4th Cir.1980),
cert. denied, 451 U.S. 907, 101 S.Ct. 1974, 68 L.Ed.2d 295 (1981). The district court’s decision to admit evidence pursuant to Rule 404(b) is within its discretion and such decision will not be disturbed unless it was arbitrary or irrational.
Greenwood, 796 F.2d at 53.
The defendant first argues that the case should be remanded because the district court failed to state on the record the reasons for admitting the Rule 404(b) evidence. He cites United States v. Kendall, 766 F.2d 1426 (10th Cir.1985), cert. denied, 474 U.S. 1081, 106 S.Ct. 848, 88 L.Ed.2d 889 (1986) to support his proposition. In Kendall, the Tenth Circuit held that, in order to admit evidence under Rule 404(b), the trial court must specifically identify the puteóse for which such evidence is offered and a broad statement merely invoking or restating the rule will not suffice. Id. at 1436. The court explained that “[a] specific articulation of the relevant purpose and specific inferences to be drawn from each proffer of evidence of other acts will enable the trial court to more accurately make an informed decision and weigh the probative value of such evidence against the risks of prejudice specified in Rule 403.” Id. at 1436-37.
In contrast, at least two circuits have held that on-the-record determination of the probative value of the proffered evidence is not necessary. United States v. Braithwaite, 709 F.2d 1450, 1455-56 (11th Cir.1983) (on-the-record finding need not be made if the evidence proffered under Rule 404(b) was not of a conviction but of an arrest); United States v. Gilmore, 730 F.2d 550, 554 (8th Cir.1984) (although explicit ruling on admissibility of evidence of prior wrong acts is preferable, ruling of admissibility based on off-the-record bench discussion carries with it implicit ruling that standards of admissibility have been met). While an explicit ruling may be preferable and may indeed aid this Court in reviewing the record, we find the Eighth and Eleventh Circuits’ decisions to be more persuasive than that of the Tenth Circuit. Therefore, the trial court’s failure specifically to identify the purpose for which the evidence is offered and admitted was not reversible error.
On the merits, we believe that the evidence was properly introduced to show knowledge, common scheme or plan. Both Bedekovic and Ward testified that Rawle used to drive tractors laden with marijuana but eventually relinquished those duties to his family while he organized the transportation of the marijuana. Bedekovic testi
3
In order for evidence to be relevant, it must be sufficiently related to the charged offense. See United States v. Shackleford, 738 F.2d 776, 779 (7th Cir.1984).
4
The evidence is necessary and admissible where it is an essential part of the crimes on trial, see United States v. Masters, 622 F.2d 83, 86 (4th Cir.1980), or where it "furnishes part of the context of the crime.” United States v. Smith, 446 F.2d 200, 204 (4th Cir.1971).