Can prior criminal conduct be admitted to prove knowledge under Rule 404(b)?

Evidence of prior criminal conduct may be admitted to prove knowledge under Rule 404(b) if (1) the other act evidence tends to prove a material point; (2) the other act is not too remote in time; (3) the evidence is sufficient to support a finding that the defendant committed the other act; and (4) in some cases, the other act is similar to the offense charged. United States v. Bibo-Rodriguez, 922 F.2d 1398, 1400 (9th Cir.), cert. denied, --- U.S. ----, 111 S.Ct. 2861, 115 L.Ed.2d 1028 (1991). The district court's admission of the evidence is reviewed for an abuse of discretion. Id. at 1401.