Attempted Child Sex Trafficking: Reckless Disregard of Age Suffices Even Without an Actual Minor (and § 1594 Judgments Do Not Become § 1591 Convictions for First Step Act Purposes)

I. Introduction

United States v. McKenzie (1st Cir. June 12, 2026) arose from a Homeland Security Investigations online “sting” in which the defendant, Dimitri McKenzie, responded to an advertisement for commercial sex and agreed to pay for sex with “Bri,” whom the undercover agent represented to be fourteen. “Bri” did not exist; the images used were of adults (including an age-regressed image). McKenzie went to the agreed hotel with cash, received a keycard, and was arrested.

A jury convicted McKenzie of attempted sex trafficking of a child under 18 U.S.C. §§ 1591 and 1594. On appeal, McKenzie challenged (i) the mens rea standard for attempt when no actual minor exists, (ii) the denial of an entrapment instruction, (iii) several evidentiary exclusions, and (iv) the judgment’s collateral consequences under the First Step Act’s time-credit regime.

II. Summary of the Opinion

The First Circuit affirmed the conviction and held, as a matter of first impression in the circuit, that for attempted sex trafficking of a minor, the government may satisfy the age-related mens rea by proving the defendant either believed the person solicited was under 18 or recklessly disregarded a substantial and unjustifiable risk that the person was under 18—even if no actual minor was involved.

The court also clarified that McKenzie was convicted only under 18 U.S.C. § 1594 (attempt), not 18 U.S.C. § 1591, for purposes of First Step Act eligibility, notwithstanding that the judgment necessarily referenced § 1591 to specify the object offense and penalty provisions.

III. Analysis

A. Precedents Cited

1. Standards of review and framing

  • United States v. Díaz-Rosado: supplied the appellate lens for presenting facts (prosecution-favorable for sufficiency; neutral otherwise).
  • United States v. Stefanik and Uphoff Figueroa v. Alejandro: preserved-objection rules and de novo review for legal instructional error; sufficiency preservation.
  • Allen v. United States: referenced for the “Allen charge” given to a deadlocked jury (not itself a basis for reversal here).

2. Statutory interpretation and mens rea content

  • In re Fin. Oversight & Mgmt. Bd. for P.R.: “begin with the language of the statute” methodology.
  • Borden v. United States: supplied the “most common formulation” of recklessness—conscious disregard of a substantial and unjustifiable risk, in gross deviation from standards.
  • Neder v. United States: supported reading common-law-settled terms (like “reckless”) as incorporated absent contrary statutory direction.
  • Bronson v. United States: cited as rejecting “no actual minor” innocence arguments in this general attempt context.

3. Out-of-circuit attempt sex-trafficking cases (not dispositive, but canvassed)

  • United States v. Haas, United States v. Puff, United States v. Tunchez, United States v. Zam Lian Mung, United States v. Baker, United States v. Robinson: examples where courts recited or applied knowledge/reckless-disregard standards in undercover/minor-representation scenarios, but the First Circuit found them not resolving the precise question presented.
  • United States v. Wolff: relied on by McKenzie for “belief” language; the First Circuit treated that belief as “obviously sufficient” rather than “required,” invoking United States v. Saldaña-Rivera to caution against overreading holdings.
  • United States v. Medina: a First Circuit sting case approving knowledge-based instructions without implying reckless-disregard would be improper.

4. Attempt doctrine and Model Penal Code framework (central to the holding)

  • United States v. Dworken, United States v. Benítez-Beltrán, United States v. Doyon: established this circuit’s reliance on the Model Penal Code approach to attempt and its two elements (intent + substantial step), while recognizing that “intent” need not attach to every element (especially circumstance elements).
  • The court drew on the Model Penal Code commentaries and the article by Wechsler/Jones/Korn (previously relied on in United States v. Dworken) to distinguish conduct/results from circumstances and to explain why attempt liability tracks the completed offense’s culpability for circumstance elements.

5. Legislative context and “sting” validation

  • United States v. Jungers and Bittner v. United States: used to read the Justice for Victims of Trafficking Act of 2015’s purpose statements and amendment structure as contextual clues supporting the court’s interpretation (Congress endorsed purchase-focused enforcement and knew how to raise mens rea when it wanted to, e.g., advertising).

6. Impossibility and mistake-of-fact doctrine

  • United States v. Fernandez and United States v. Carter: defined “pure legal impossibility” and confirmed it is a defense.
  • United States v. Dixon (factual impossibility not a defense), United States v. Chavez (10th Cir. example), and United States v. Encarnación-Ruiz (mistake-of-fact framing re: age): reinforced that factual mistake does not bar attempt; and that reckless mistake does not negate recklessness-based culpability.
  • United States v. Bailey: reminder that common-law principles must bow to statutory mandates.
  • United States v. Mardirosian: general principle that mistake of fact is a defense only when it negates the required intent—here it would not negate recklessness.
  • United States v. Hsu: quoted for the legal-impossibility framing focused on whether the law proscribes the defendant’s goal.

7. Entrapment doctrine

  • United States v. Dávila-Nieves, United States v. O'Donovan, United States v. Sandoval, United States v. Pérez-Rodríguez, United States v. Gamache, United States v. Hinkel, United States v. Gendron, United States v. Medina-Ortiz: supplied the two-prong entrapment test (inducement + lack of predisposition) and the requirement of “opportunity plus something else” for improper inducement.
  • United States v. Symonevich: cited for harmless-error principles if the district court used an incorrect standard.

8. Evidence and preservation doctrines

  • United States v. Saemisch, United States v. Encarnacion, United States v. Duarte: offers of proof, plain-error framework, and preserved/forfeited evidentiary claims.
  • Neece v. City of Chicopee: harmless-error formulation (“highly probable” no effect).
  • United States v. Grullon: conditional in-limine ruling requires re-raising at trial to preserve.
  • United States v. Martínez-Mercado: forfeited issues can be treated as waived on appeal if plain error is not argued.

9. Judgment correction and First Step Act time credits

  • United States v. Ahmed: example of remand for Rule 36 correction where the judgment truly misidentified the conviction.
  • United States v. Warren: key analogy—judgment references to the object statute do not transform an attempt conviction into a conviction for the object offense; the appellate court may “construe/clarify” the judgment for the Bureau of Prisons.
  • United States v. Phillips: district court example following a similar approach.

B. Legal Reasoning

1. The new rule on mens rea for attempt when the “minor” is fictional

The court treated “age” as a circumstance element of § 1591(a), not a result caused by the defendant. Under the circuit’s Model Penal Code-informed attempt doctrine, attempt requires intent as to the defendant’s conduct (soliciting) and the result (commercial sex being caused), but as to circumstances it requires only the same level of culpability needed for the completed crime.

Because completed § 1591(a) expressly allows conviction where the defendant acted “knowing, or … in reckless disregard of the fact” that the person is under 18, the attempt statute (§ 1594(a)) incorporates that same circumstance-level mens rea. The court rejected a “sting carve-out” that would raise the mens rea to belief/knowledge whenever no actual minor exists.

2. Rejection of “legal impossibility” as a limit on reckless-disregard attempt

McKenzie argued that if he genuinely believed “Bri” was an adult, convicting him would punish an attempt to do something lawful (solicit an adult), i.e., “legal impossibility.” The court disagreed, reframing the proscribed “goal” under the statute as soliciting commercial sex while recklessly disregarding the risk that the person is a minor. A reckless mistake about age cannot negate a crime whose culpability level is recklessness as to age.

3. Entrapment and evidentiary issues

The court held McKenzie failed the “inducement” prong because the government did not apply improper pressure—after he texted “I’m not into anything under 18,” the agent ended the exchange, and McKenzie reinitiated. The rest of the communications were framed as opportunity, not “opportunity plus something else.” This made predisposition evidence immaterial, and also undercut asserted relevance of excluded evidence tied to entrapment.

4. First Step Act / judgment clarification

The panel acknowledged a practical Bureau of Prisons consequence: time credits are available to prisoners serving sentences “under” § 1594 but not § 1591. The judgment properly referenced § 1591 to specify the object and penalty provisions, so there was no “clerical error” for Rule 36. Instead, the court issued a clarifying construction: McKenzie was convicted only under § 1594, aligning the judgment’s legal meaning with the First Step Act’s text and avoiding a reading that would effectively nullify eligibility for all § 1594 attempt convictions.

C. Impact

  • Expanded prosecutorial pathway in sting cases: In the First Circuit, the government need not prove the defendant actually believed the target was under 18 when prosecuting attempted child sex trafficking arising from undercover operations; proof of reckless disregard of a substantial and unjustifiable risk of minority can suffice.
  • Doctrinal clarity on attempt elements: The opinion operationalizes the “circumstance” concept in federal attempt law, making explicit that attempt intent does not automatically attach to every element—an approach likely to be cited in future attempt prosecutions beyond § 1591.
  • Impossibility doctrine narrowed to statutory design: By aligning “legal impossibility” with the statute’s actual proscription (including recklessness as to circumstance), the decision limits the utility of impossibility arguments where Congress criminalizes risk-aware conduct.
  • Administrative consequences and sentencing administration: The clarification regarding § 1594 judgments provides a roadmap for litigants facing BOP misclassification under the First Step Act, encouraging reliance on appellate “construction” (per United States v. Warren) where Rule 36 is unavailable.

IV. Complex Concepts Simplified

  • Attempt (federal): Generally requires (1) intent to commit the crime and (2) a substantial step toward it. Under the Model Penal Code approach used here, “intent” is strongest for the defendant’s actions and desired results, but circumstances (like a victim’s age) can carry a lower mens rea if the completed offense does.
  • “Circumstance” vs. “result” elements: A result is something the defendant brings about (e.g., causing commercial sex). A circumstance is a fact about the world that must be present (e.g., the person is under 18) but is not “caused” by the defendant.
  • Reckless disregard: Not mere negligence. It requires awareness of a substantial risk and proceeding anyway—i.e., conscious risk-taking that grossly deviates from acceptable conduct.
  • Factual vs. legal impossibility: Factual impossibility (you tried but facts prevented completion—e.g., “minor” was actually an adult) is not a defense to attempt. Pure legal impossibility (even if completed, the act would not be illegal) can be a defense, but only when the defendant’s “goal” is not criminal under the statute as written.
  • Entrapment (“opportunity plus something else”): Government may offer an opportunity; entrapment requires improper inducement—pressure, threats, manipulation, repeated badgering, or exploiting sympathy.
  • Rule 36 clerical error: A narrow tool to fix scrivener-type mistakes in a judgment, not to change a judgment that is legally accurate but produces downstream administrative confusion.
  • First Step Act time credits issue here: Congress made § 1594 sentences eligible but § 1591 sentences ineligible. Because attempt judgments must reference the object offense, a BOP rule treating any reference to § 1591 as disqualifying would defeat Congress’s eligibility decision for § 1594 attempts—hence the court’s clarification.

V. Conclusion

United States v. McKenzie establishes a consequential First Circuit rule: for attempted sex trafficking of a minor under 18 U.S.C. §§ 1591(a)(1) and 1594(a), the government may prove the age element by showing either belief/knowledge or reckless disregard of a substantial and unjustifiable risk of minority—even when no actual minor exists (including fictional targets created by law enforcement).

The opinion also addresses an increasingly common friction point between judgments and prison administration, clarifying that an attempt conviction “under § 1594” does not become a conviction “under § 1591” merely because the judgment must reference § 1591 as the object offense, thereby preserving § 1594-based First Step Act eligibility as Congress directed.