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Medical mistakes and criminal intent

Evann Herrell and Keri McFarlane v. United States

Updated Nov 12, 2026

In brief

Where it stands
Dismissed

Petition denied.

What it’s about
Evann Herrell and Keri McFarlane asked the Supreme Court to review whether the jury instructions in their federal prescribing case adequately required proof that they knew their prescribing was unauthorized, given the use of professional standards as evidence and the judge’s refusal to say malpractice alone does not prove criminal knowledge.
Who it affects
The Supreme Court will not review Herrell and McFarlane's challenge; its order makes no ruling on their jury-instruction claim.

Summary: written with AI from the case record.

Illustration for Evann Herrell and Keri McFarlane, Petitioners v. United States
Conceptual illustration · AI-generated

What it's about

The Court refused to hear the case (denied review), so it did not decide that question.

The dispute concerns how jurors assess a doctor's knowledge when prosecutors use professional prescribing standards as evidence.

Question presented

Whether, after Ruan v. United States , 597 U.S. 450 (2022), a jury instruction requiring proof that a physician knew the prescribing was unauthorized adequately protects § 841‘s subjective mens rea requirement when the Government relies on objective professional standards as evidence of knowledge and the district court refuses a requested instruction explaining that malpractice and deviations from the standard of care do not themselves establish criminal knowledge?

Documents

1

Docket activity

6
  • New analysis added

    Nov 12, 2026 · Court records

  • AI analysis generated: Case Briefing

    Nov 12, 2026 · Generated

  • AI analysis generated: Decision Record

    Nov 12, 2026 · Generated

  • Case data updated: summary, question_presented, generation_metadata

    Nov 12, 2026 · Court records

  • Case data updated: question_presented, extraction_metadata

    Nov 12, 2026 · Court records

Show 1 more
  • Brief added: Petition

    Sep 14, 2026 · Court records

Sources

Primary materials plus reporting. Best-effort analysis: this explainer relies on a mix of primary materials and trusted secondary sources. Official filings and opinions remain authoritative.

Checked Nov 12, 2026Methodology

Court records and filings

Reporting and analysis