In United States v. Ruiz, --- F.4th ---, No. 24-386 (9th Cir. 2026), the Court affirmed Alex Ruiz’s conviction for transporting illegal aliens in violation of 8 U.S.C. § 1324, in a case in which Ruiz argued that the district court abused its discretion in admitting evidence of his previous conviction for the same crime.
"We have developed a four-part test to decide when a prior bad act is admissible: '(1) the 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 defendant committed the other act; and (4) (in certain cases) the act is similar to the offense charged.'" The Court concluded the prior conviction satisfied all four prongs.
As to the similarity prong, the Court explained, "it matters how we go about assessing similarity. One approach this court has used in answering that question is to compare the magnitude of the differences in the crimes in the current case to the differences that this court has approved as 'similar' in past cases. Applying that framework, Ruiz’s current crime and his past conviction are similar."
"In sum, the prior conviction satisfies each prong of the test for Rule 404(b)—it tended to prove the material point of knowledge, two years is not too remote in time, the stipulation and redacted documents provided sufficient evidence of the prior bad act, and the prior crime was sufficiently similar to the offense charged. Therefore, the district court did not abuse its discretion in admitting the prior conviction under Rule 404(b)."
