Understanding the United States v. Mendoza Ruling: Technical Insights for Defense Attorneys in Military Sexual Assault Cases

Legal update — 29 September 2026: This discussion incorporates United States v. Casillas (20 August 2025), United States v. Moore (23 January 2026), and United States v. Grafton (17 September 2026). Instruction requests must fit the charges, evidence and version of Article 120 applicable to the alleged conduct. The examples below identify principles for counsel to address; they are not official pattern instructions.

The 7 October 2024 United States v. Mendoza decision by the Court of Appeals for the Armed Forces (CAAF) has significant implications for military sexual assault defenses, especially in cases where intoxication is a factor. This ruling delineates the distinction between sexual assault without consent under Article 120(b)(2)(A) and sexual assault when the alleged victim is incapable of consenting under Article 120(b)(3)(A), clarifying that these are separate theories of liability with different elements. Later decisions explain why those theories are not necessarily mutually exclusive. Defense attorneys need to be aware of how this impacts jury instructions and the prosecution’s burden of proof.

This article provides a detailed breakdown of the Mendoza ruling and explains the critical modifications defense counsel should request regarding jury instructions in cases where sexual assault without consent and sexual assault when incapable of consenting are charged in the alternative.

The Mendoza Ruling: A Crucial Distinction Between Theories of Liability

In Mendoza, the CAAF emphasized the legal distinction between two theories of sexual assault under Article 120(b):

1. Sexual Assault Without Consent (Article 120(b)(2)(A)): The government must prove a sexual act and lack of consent. Incapacity alone does not establish lack of consent. Under Moore, evidence of no consent before a period of incapacity, together with the later sexual act, may establish this offense.
2. Sexual Assault When Incapable of Consenting (Article 120(b)(3)(A)): This offense involves situations where the alleged victim was incapable of consenting due to intoxication, and the accused knew or reasonably should have known that the alleged victim was incapable of consenting due to that impairment.

These two provisions require different types of proof, and it is essential for defense attorneys to understand how these distinctions affect the prosecution’s case.

Legal Principles Established in Mendoza

The Mendoza ruling clarified that the Government cannot prove sexual assault without consent simply by showing that the alleged victim was too intoxicated to consent. The court highlighted that this approach circumvents the mens rea requirement in Article 120(b)(3)(A). Specifically, under Article 120(b)(3)(A), the Government must prove that the accused knew or reasonably should have known that the alleged victim was incapable of consenting due to intoxication. In contrast, Article 120(b)(2)(A) does not require the Government to prove any mens rea regarding the alleged victim’s ability to consent.

The government must prove the elements of the charged offense beyond a reasonable doubt. Mendoza prevents the government from substituting incapacity alone for proof of lack of consent. It also protects notice of the offense and theory the accused must defend against; it does not exclude intoxication evidence from the consent inquiry.

Why Instruction Modifications Are Essential

Counsel should review the instructions in light of Mendoza and the later decisions to determine whether a tailored clarification is needed to distinguish the two offenses. Without proper instructions, jurors may wrongly convict a defendant of sexual assault without consent based solely on evidence that the alleged victim was intoxicated and incapable of consenting, effectively bypassing the mens rea requirement under Article 120(b)(3)(A).

The defense should request modifications that ensure the instructions clearly differentiate between the two theories of liability, particularly in cases where the charges are presented in the alternative.

For example, the defense must request that the instruction on sexual assault without consent include the following clarifications:

• Definition of Consent: “Consent” means a freely given agreement to the conduct at issue by a competent person. Lack of verbal or physical resistance does not constitute consent, and submission due to force, fear, or threat of force also does not qualify as consent. The instruction should make clear that incapacity due to intoxication cannot, by itself, establish lack of consent under Article 120(b)(2)(A). Intoxication remains relevant among the surrounding circumstances.

Key Instructional Modifications

Defense attorneys should request three key modifications to jury instructions in light of Mendoza:

1. Clarification of the Definition of Consent for Article 120(b)(2)(A):

• The instruction should accurately define consent and explain the government’s burden to prove lack of consent beyond a reasonable doubt. It should not prevent consideration of intoxication. In Casillas, CAAF rejected an instruction that would have barred members from considering whether the alleged victim was too intoxicated to consent.

2. Clarification on the Use of Intoxication as Evidence:

• The members may consider intoxication with all the surrounding circumstances when deciding whether the alleged victim consented. They cannot establish lack of consent merely by finding incapacity. Where an incapacity offense is also charged, the evidence may bear on that offense’s separate elements.

3. Separation of Theories of Liability:

• Instructions must identify the elements of each charged offense. Grafton rejects a blanket rule that members cannot return guilty findings on both alternative specifications. When charges are brought for exigencies of proof, consolidation or dismissal must be addressed. Counsel should evaluate the particular charges, evidence and required relief rather than assume the theories are mutually exclusive.

The appropriate instructions depend on the charges and evidence. The same evidence may be relevant to more than one offense, but the government must prove each charged offense’s elements.

Practical Application: How to Frame Your Instruction Requests

Counsel should identify the precise risk of confusing incapacity with lack of consent, request accurate instructions supported by the evidence, and preserve objections. Casillas makes clear that counsel should not request a blanket prohibition on considering intoxication in deciding lack of consent. Moore also requires attention to whether consent was absent before incapacity or after the person awoke during an ongoing sexual act.

By ensuring that these distinctions are made clear, the defense can safeguard the accused’s constitutional rights and ensure that the Government meets its burden of proof for each element of the charged offense.

Conclusion: Mendoza as a Defense Tool

The Mendoza ruling serves as a powerful tool for defense attorneys, especially in cases where intoxication is a factor. The decision not only clarifies the distinction between different theories of sexual assault but also reinforces the necessity of accurate jury instructions to avoid due process violations. By leveraging Mendoza in your defense strategy, you can challenge overreaching prosecutorial tactics and ensure that your client’s rights are fully protected under the law.

Defense counsel should remain vigilant in requesting tailored jury instructions and ensuring that courts do not conflate the distinct elements of sexual assault without consent and sexual assault when incapable of consenting.

Consult With a Civilian Defense Counsel Today

If you’re a service member facing military sexual assault charges, understanding the legal nuances of cases like United States v. Mendoza is crucial to your defense. The distinction between intoxication and consent can be the key to winning your case, and having a defense team that knows how to leverage these rulings is essential. At Bilecki Law Group, we specialize in defending service members in military courts, ensuring that your rights are protected every step of the way. Contact us today to discuss your case and learn how we can help defend your future.