United States v. Gomez and the Rule 404(b) Evidence Standard
Attorney Michael J. Petro represented Nicolas Gomez during the motion to suppress proceedings, at trial, on direct appeal, and during the en banc appeal before the United States Court of Appeals for the Seventh Circuit. The resulting decision changed how federal courts within the Seventh Circuit evaluate evidence of prior crimes, wrongs, and other acts under Federal Rule of Evidence 404(b).
If federal prosecutors are attempting to use prior conduct or a previous conviction against you, contact federal criminal defense attorney Michael J. Petro to discuss challenging the evidence before it reaches the jury.
What Happened in United States v. Gomez?
In United States v. Gomez, federal agents investigated a cocaine distribution organization operating between Chicago and Milwaukee.
Wiretapped telephone calls revealed that a supplier named Robert Romero was conducting cocaine transactions with a person known as “Guero.” Investigators believed that Nicolas Gomez was Guero.
At trial, the government introduced more than 50 recorded conversations describing cocaine transactions. The telephone evidence connected the calls to Gomez’s residence, but Gomez maintained that Guero was actually his brother in law, who lived in the same home.
The government introduced a small quantity of cocaine discovered in Gomez’s bedroom at the time of his arrest. Prosecutors argued that the cocaine helped establish that Gomez was Guero, the person participating in the recorded drug transactions.
The defense objected under Federal Rule of Evidence 404(b).
What Does Federal Rule of Evidence 404(b) Prohibit?
Federal Rule of Evidence 404(b) prohibits the use of another crime, wrong, or act to prove a person’s character and show that the person acted in accordance with that character during the charged offense.
The prosecution generally cannot ask a jury to reason:
• The defendant committed misconduct before.
• The prior misconduct demonstrates a criminal character.
• The defendant therefore probably committed the charged offense.
This is known as propensity reasoning.
Rule 404(b) permits other act evidence for a legitimate purpose, such as proving motive, opportunity, intent, preparation, plan, knowledge, identity, absence of mistake, or lack of accident. But identifying one of these purposes does not automatically make the evidence admissible.
The Seventh Circuit Abandoned Its Former Four Part Test
Before Gomez, the Seventh Circuit used a four part test to evaluate the admissibility of other act evidence. Sitting en banc, the court concluded that this test had ceased to be useful.
The court replaced it with a more direct analysis based on the Federal Rules of Evidence themselves.
Under the rules based framework, the court must determine:
• Whether the other act evidence is relevant under Rules 401 and 402.
• Whether it is offered for a permissible purpose under Rule 404(b).
• Whether its relevance depends on a prohibited propensity inference.
• Whether its probative value is substantially outweighed by unfair prejudice or another danger identified in Rule 403.
This approach requires courts to examine exactly how the evidence proves a disputed issue.
Prosecutors Must Identify a Propensity Free Chain of Reasoning
The central lesson from Gomez is that a prosecutor cannot establish admissibility merely by selecting “knowledge,” “intent,” or another purpose listed in Rule 404(b).
The government must identify a complete chain of reasoning connecting the prior act to a material issue in the case. That reasoning must not depend on an assumption that the defendant has a criminal character and acted consistently with it.
A court should ask:
• What specific fact does the evidence supposedly prove?
• Is that fact material to the charged offense?
• Is the fact genuinely disputed?
• How does the prior act make that fact more or less probable?
• Does any step in the reasoning depend on the defendant’s supposed criminal tendencies?
When the answer to the final question is yes, Rule 404(b) generally prohibits the evidence.
Intent Requires Special Caution
Prosecutors frequently argue that prior acts are admissible to establish intent. But intent is also one of the permitted purposes most likely to conceal an improper propensity argument.
Evidence does not become admissible simply because intent is technically an element of the charged offense.
When intent is not meaningfully contested, prior act evidence may have little legitimate probative value. Its primary effect may be to portray the defendant as someone likely to commit the charged crime.
When intent is genuinely disputed, other act evidence still must be relevant without relying on propensity. The court must then determine whether the probative value is substantially outweighed by the risk of unfair prejudice.
Rule 403 Remains an Essential Safeguard
Even when other act evidence has some relevance for a proper purpose, Federal Rule of Evidence 403 may require its exclusion.
Rule 403 permits a court to exclude evidence when its probative value is substantially outweighed by dangers including unfair prejudice, confusing the issues, or misleading the jury.
This balancing is critical because evidence of prior criminal conduct almost always creates some risk that jurors will use it improperly.
The court should consider:
• How strongly the evidence proves the claimed purpose.
• Whether the issue is actually contested.
• Whether less prejudicial evidence is available.
• How similar the prior act is to the charged offense.
• Whether the evidence may distract the jury from the charged conduct.
• How likely the jury is to draw a forbidden propensity inference.
The government’s need for the evidence should decrease when the same point can be established through less prejudicial proof.
Why the Cocaine Evidence Was Improperly Admitted
The government argued that the small quantity of cocaine found in Gomez’s bedroom helped prove that he was Guero, the participant in the recorded drug transactions.
The Seventh Circuit concluded that the district court should not have admitted the evidence for that purpose.
The connection between possessing a small amount of cocaine and being the person identified as Guero was extremely weak. The government failed to articulate a coherent propensity free explanation of how the cocaine established Gomez’s identity.
The evidence invited the jury to assume that because Gomez possessed cocaine, he was probably involved in cocaine trafficking and therefore must have been Guero. That reasoning depended on the type of character and propensity inference prohibited by Rule 404(b).
Why the Conviction Was Affirmed
Although the Seventh Circuit found that the cocaine evidence was admitted improperly, it affirmed Gomez’s conviction because it concluded that the error was harmless.
The government had presented substantial additional evidence connecting Gomez to the recorded telephone conversations and the cocaine distribution operation. The court determined that excluding the small quantity of cocaine would not have made the prosecution’s case significantly less persuasive.
This distinction is important. The court did not approve the admission of the cocaine evidence. It found an evidentiary error but concluded that the remaining evidence was strong enough to prevent reversal.
Gomez Established an Important Rule 404(b) Framework
The en banc decision requires prosecutors and trial courts to do more than attach a permitted label to prejudicial evidence.
The prosecution must explain how the evidence proves a legitimate issue without depending on criminal propensity. The district court must then conduct a meaningful Rule 403 analysis based on the facts, disputed issues, and actual need for the evidence.
The Seventh Circuit later applied this framework in United States v. Chapman, where it reversed a conviction because prosecutors improperly used a prior heroin conviction as evidence of knowledge and intent. Read more about Federal Rule 404(b) and the improper use of prior bad acts.
Challenging Other Act Evidence Before Trial
Defense counsel should require the government to identify every prior act it intends to introduce and explain the specific purpose and reasoning supporting admission.
A proper challenge should address:
• Whether the government provided timely written notice.
• Whether the notice identifies a specific permitted purpose.
• Whether the government explains its complete reasoning.
• Whether the proposed evidence depends on propensity.
• Whether the identified issue is genuinely contested.
• Whether the evidence is cumulative or unnecessary.
• Whether unfair prejudice substantially outweighs its probative value.
• Whether an appropriate limiting instruction is possible.
The objection should ordinarily be raised before trial through a motion in limine. Defense counsel should also create a complete record of the government’s theory, the court’s ruling, the Rule 403 analysis, and any requested limiting instruction to preserve the issue for appeal.
Michael J. Petro represents clients facing federal criminal charges in Tampa and Chicago, and if the government is trying to use prior acts or alleged misconduct to prejudice the jury against you, contact federal criminal defense attorney Michael J. Petro.