Objective “Legitimate Medical Purpose/Usual Course” Criteria Remain Valid to Prove Post-Ruan Mens Rea Under the CSA; Masked-Witness Confrontation Claims Require Prejudice on Plain-Error Review

I. Introduction

United States v. Bernard Shelton (Sixth Circuit, July 1, 2026) affirms the controlled-substance convictions of a Michigan physician for issuing prescriptions that the jury found to be unauthorized under the Controlled Substances Act (“CSA”), 21 U.S.C. § 841(a)(1), including a death-results enhancement under 21 U.S.C. § 841(b)(1)(C). The case sits at the intersection of (1) the Supreme Court’s post-Ruan mens rea framework for prescriber prosecutions, (2) challenges to the Attorney General/DEA regulatory role in defining prescribing authorization, and (3) pandemic-era courtroom procedures and the Sixth Amendment.

The key disputes were:

  • Sufficiency: whether evidence of “pill mill” indicators (drug-seeking red flags, lack of exams, dangerous drug combinations, falsified charting, and continued prescribing despite failed screens) permitted a rational inference that Shelton knew or intended his prescribing was unauthorized.
  • Regulatory authority: whether 21 C.F.R. § 1306.04(a)’s “legitimate medical purpose” / “usual course of professional practice” standard reflects an unconstitutional delegation or triggers the major questions doctrine.
  • Jury instructions: whether the district court improperly “objectivized” authorization or failed to correctly convey Ruan’s scienter requirement.
  • Confrontation Clause: whether requiring testifying witnesses to wear masks violated face-to-face confrontation and warranted reversal.

II. Summary of the Opinion

The Sixth Circuit affirmed across the board. It held:

  • Evidence was sufficient to prove Shelton knowingly or intentionally prescribed controlled substances without authorization, and to support the death-results enhancement.
  • Regulatory challenges failed under plain-error review: the court found no clear conflict between the CSA and 21 C.F.R. § 1306.04(a), emphasizing that Supreme Court precedent treats the regulation as consistent with—indeed largely paraphrasing—statutory language.
  • Jury instructions complied with Ruan: while authorization is described using objective criteria (“legitimate medical purpose” and “usual course”), the jury was repeatedly instructed that conviction required proof Shelton knew or intended the prescriptions were unauthorized; objective deviation could be used as circumstantial evidence of that subjective state of mind.
  • Mask mandate was not reversible on plain-error review: even assuming error (including lack of case-specific necessity findings), Shelton did not show prejudice—i.e., a reasonable probability of a different outcome without the masks.

III. Analysis

A. Precedents Cited

1. Sufficiency of the evidence framework

The court’s review method was anchored in United States v. Siefert, which supplies the “any rational trier of fact” standard and the rule that evidence is viewed in the government’s favor. The panel reiterated the appellate limitation from United States v. Jackson: the court will not reweigh evidence or reassess credibility—an important move because Shelton’s defense largely recast the proof as consistent with medical treatment.

For the death-results enhancement, the panel used Burrage v. United States for the two-part requirement under § 841(b)(1)(C), noting Shelton conceded causation and contested only unauthorized distribution.

2. Post-Ruan authorization and mens rea

The Sixth Circuit treated United States v. Getachew as its key circuit formulation: for prescribers, unauthorized distribution is prescribing “without a legitimate medical purpose and outside the usual course of medical practice,” and—critically after Ruan v. United States—the government must also prove the doctor knew or intended the conduct was unauthorized.

Ruan v. United States supplied the opinion’s central doctrinal mechanics: (i) authorization is framed by the regulation’s objective criteria, and (ii) those objective criteria may be used to prove subjective mens rea via circumstantial evidence (unreasonableness measured against objective criteria supports an inference of knowledge). The panel relied on United States v. Bauer for the proposition that “repeated and brazen violations of medical norms don’t happen by mistake,” and for approving the use of objective red-flag evidence to infer subjective intent.

The court further supported inference-from-red-flags using its “pill mill” line: United States v. Stanton (listing red flags), United States v. Anderson (doctor ignoring addiction signs), and United States v. Sherman (failure to examine/diagnose/consider red flags permits inference of subjective knowledge). United States v. Romano was used as an example that a prescriber’s statements about fear of “undercover” scrutiny can evidence consciousness of wrongdoing.

On falsified documentation and deception, the court analogized to intent in fraud contexts via United States v. Washington: fabricated records can support inferences of knowledge/intent.

3. Nondelegation doctrine and regulatory consistency

Because Shelton raised the nondelegation/major questions theories post-trial, the panel applied plain-error review and cited out-of-circuit preservation examples: United States v. Margarita Garcia and United States v. Brandao. It stated the plain-error test via United States v. Burrell.

Substantively, the nondelegation discussion followed the Supreme Court’s familiar structure: Touby v. United States and Mistretta v. United States (Congress may enlist coordinate branches if it supplies an “intelligible principle”). The “plainness” analysis relied on United States v. Tellez for the proposition that error is not “plain” absent obvious conflict with controlling law.

The court treated Gonzales v. Oregon as the decisive rebuttal to Shelton’s core premise: it quoted Gonzales to the effect that 21 C.F.R. § 1306.04(a) “merely” paraphrases the CSA’s statutory language. The panel also pointed to CSA provisions using near-identical terms (including the “legitimate medical purpose” / “usual course of professional practice” phrasing), and reinforced physician liability under § 841 through United States v. Moore. United States v. Suetholz supplied a recent Sixth Circuit restatement that a prescription is authorized when it meets the regulation’s standard.

When Shelton urged a different interpretive approach, the court emphasized vertical stare decisis with United States v. Wandahsega, and rejected “plainness” given unsettled law by analogy to United States v. Woodruff.

4. Major questions doctrine

The court addressed the doctrine through circuit and Supreme Court articulations: Allstates Refractory Contractors, LLC v. Su (doctrine limited to extraordinary cases), West Virginia v. EPA (agency must show clear authorization when claiming transformative power), and it referenced Gundy v. United States (as part of the doctrine’s broader modern debate). The panel also cited Learning Resources, Inc. v. Trump for the “transformative” characterization.

The panel’s bottom line was that § 1306.04(a) is not an extraordinary, transformative assertion of federal power over medicine; it is a longstanding evidentiary/definitional tool aligned with the CSA and Supreme Court treatments in Ruan v. United States, Gonzales v. Oregon, and United States v. Moore.

5. Jury instruction standards and post-Ruan instructions

The court used United States v. You for instruction review methodology and United States v. Betro for the rule that reversal is warranted only if, viewed as a whole, the instructions were confusing, misleading, or prejudicial.

On substance, the panel emphasized that objective criteria may be referenced to prove knowledge, citing United States v. Campbell (objective criteria can prove knowledge of lack of authorization) and United States v. Bauer. It analogized the instruction’s focus on the defendant’s knowledge to approvals in United States v. Iwas (pharmacist case) and United States v. Herrell (instructions acceptable when tracking Ruan nearly verbatim). It also reiterated the need to direct the jury to the defendant’s subjective mindset, echoing United States v. Anderson.

6. Confrontation Clause and masking

For Confrontation Clause basics, the panel cited Delaware v. Van Arsdall (core purpose is cross-examination), and the “face-to-face” baseline through Pitts v. Mississippi, which in turn draws on Coy v. Iowa and Maryland v. Craig. The panel recognized Craig’s allowance of exceptions when necessary to further important public policy and when reliability is otherwise assured, but emphasized that Pitts v. Mississippi requires case-specific findings rather than generalized necessity. It noted the post-Crawford v. Washington critique of open-ended balancing tests, while still applying existing Supreme Court doctrine.

On the masking question’s unsettled nature, the panel referenced persuasive authority: United States v. Maynard (Fourth Circuit), United States v. Jenkins (Seventh Circuit), and United States v. Graham (Ninth Circuit, unpublished; cert. denied). For “plain error must be obvious,” the panel relied on United States v. Hills. It also contrasted district court approaches that sought fuller facial visibility: United States v. Davis, United States v. Schwartz, and United States v. Robertson.

Ultimately, even assuming error, the panel resolved the issue on the prejudice requirement of plain-error review, citing the prejudice articulation through United States v. Hamm and Molina-Martinez v. United States (as quoted via United States v. Bauer). It analogized to a prior Sixth Circuit assumption-without-decision approach in United States v. Smith.

B. Legal Reasoning

1. How the court inferred subjective knowledge from objective “red flags”

The opinion operationalizes Ruan in a practical evidentiary way: the government need not produce a “smoking gun” admission. Instead, repeated departures from professional norms—especially when compounded across multiple patients—permit a jury to infer the prescriber’s subjective knowledge that prescriptions were unauthorized.

The court highlighted: doctor-shopping indicators (MAPS reports), requests for specific controlled substances by name, dangerous combinations (including the “holy trinity”), continued prescribing despite failed or absent drug screens, known illegal drug use, lack of physical examinations, suspected falsification of records, and continued prescribing despite evidence patients were obtaining drugs from non-medical sources. The panel treated the “aggregate” of these facts as the crucial inference engine.

2. Regulatory authority: why § 1306.04(a) was treated as consistent with the CSA

Shelton’s nondelegation/major-questions framing depended on the claim that § 1306.04(a) introduces an extra-statutory, liability-expanding “objective standard.” The panel rejected that characterization by:

  • invoking Gonzales v. Oregon’s statement that the regulation paraphrases statutory language;
  • pointing to CSA provisions that embed similar phrases (e.g., “legitimate medical purpose” and “usual course of professional practice”);
  • observing that physician prosecutions under § 841 for conduct outside professional practice are longstanding under United States v. Moore;
  • treating the regulatory language primarily as a definitional/evidentiary lens, not as a free-standing federal medical-practice code.

Critically, the court did not need to announce a broad theory of delegation to dispose of Shelton’s claims, because plain-error review required Shelton to show an obvious conflict with controlling law—which he could not.

3. Jury instructions: objective criteria as circumstantial evidence, not a substitute mens rea

The court’s instruction analysis draws a firm line: objective criteria can be used to assess whether a prescription was unauthorized and to infer whether the defendant knew it was unauthorized, but conviction still requires a finding of subjective knowledge or intent. The panel deemed it decisive that the instructions repeatedly required proof that Shelton “kn[ew] or intend[ed]” the prescriptions were unauthorized and defined “knowingly” in a way that excluded ignorance, mistake, or accident.

This is the opinion’s most generally applicable doctrinal point for post-Ruan prosecutions: referencing “legitimate medical purpose” / “usual course” does not become an impermissible objective-liability regime when the jury is properly instructed that the government must prove the defendant’s subjective state of mind.

4. Masking: the court’s two-step plain-error escape valve

The panel handled masking through two independent barriers to reversal on plain-error review:

  1. No clearly established on-point prohibition in Supreme Court or Sixth Circuit precedent, making any error not “plain.”
  2. No prejudice showing: Shelton failed to identify which masked witness’s credibility mattered, how masking likely altered the jury’s assessment, and why that would have changed the verdict. The court treated this omission as fatal under the substantial-rights prong.

Notably, the court acknowledged that Maryland v. Craig and Pitts v. Mississippi require case-specific findings to justify departing from face-to-face confrontation, and it pointed out the district court made none. Yet it still affirmed because Shelton did not carry his burden to show outcome-changing prejudice.

C. Impact

  • CSA prescriber cases: The decision strengthens a Sixth Circuit pattern that post-Ruan prosecutions may rely heavily on objective “red flag” evidence—doctor shopping data, failed drug tests, lack of examinations, and dangerous combinations—to prove subjective knowledge. It also signals that dramatic practice changes after DEA contact can be argued as consciousness-of-wrongdoing evidence.
  • Attacks on § 1306.04(a): While the opinion does not foreclose a preserved, fully developed delegation challenge in a future case, it makes clear that, at minimum, such arguments face steep hurdles given Gonzales v. Oregon, the CSA’s text, and longstanding precedent.
  • Jury instructions post-Ruan: The opinion is a roadmap for instruction drafting: include the “legitimate medical purpose/usual course” language, but tether guilt explicitly to proof that the defendant knew or intended unauthorized prescribing; explain that objective deviation is only circumstantial evidence.
  • Confrontation Clause litigation: The opinion incentivizes defendants to object contemporaneously to masking and to build a record: request alternatives, demand case-specific findings, and articulate concrete prejudice tied to particular witnesses. Without that, plain-error review will usually be outcome-determinative.

IV. Complex Concepts Simplified

  • “Except as authorized” (21 U.S.C. § 841(a)(1)): Not every distribution of a controlled substance is illegal; it is illegal when done without the permission the law recognizes (for doctors, within professional bounds).
  • 21 C.F.R. § 1306.04(a): A regulation stating that a controlled-substance prescription must be for a “legitimate medical purpose” and in the “usual course” of professional practice to be effective (i.e., valid/authorized).
  • Ruan mens rea: The government must prove not just that the prescription was outside professional norms, but that the prescriber knew or intended it was unauthorized. Objective departures help prove subjective awareness.
  • Drug diversion / “red flags”: Patterns suggesting prescriptions are being misused or sold (doctor shopping, failed screens, requesting specific drugs, unusual combinations, lack of exams).
  • Nondelegation doctrine: Congress cannot hand off raw lawmaking power, but it can delegate tasks if it provides an “intelligible principle” guiding the agency.
  • Major questions doctrine: Courts demand clear congressional authorization when agencies claim extraordinary, politically/economically significant powers.
  • Plain-error review: A demanding standard used when an issue wasn’t properly preserved; the defendant must show an obvious legal error that likely changed the outcome and seriously undermined the proceedings.
  • Confrontation Clause “face-to-face” vs. cross-examination: Face-to-face confrontation is the “usual rule,” but the core guarantee is meaningful cross-examination; exceptions can exist with adequate justification and reliability safeguards.

V. Conclusion

United States v. Bernard Shelton reinforces a pragmatic post-Ruan approach in the Sixth Circuit: objective medical-practice benchmarks and “pill mill” red flags remain central tools for proving a prescriber’s subjective knowledge that prescriptions were unauthorized, so long as the jury is required to find that knowledge or intent. The opinion also positions 21 C.F.R. § 1306.04(a) as textually and precedentially aligned with the CSA, limiting the immediate viability of nondelegation and major-questions attacks—especially on plain-error review. Finally, in the confrontation setting, the case underscores that masking-related claims will rarely succeed without timely objection and a concrete, witness-specific showing that masking likely changed the verdict.