Luis Jaime Castillo Butters v. National Academy of Sciences and Marcia McNutt

Castillo Butters v. National Academy of Sciences, No. 24-7068 (D.C. Cir. May 22, 2026) · United States Court of Appeals for the District of Columbia Circuit · May 22, 2026 · No. 24-7068; consolidated with 25-7001

Summary

The United States Court of Appeals for the District of Columbia Circuit reviews consolidated appeals arising from the dismissal of Luis Jaime Castillo Butters’s claims for defamation, defamation by implication, and false light invasion of privacy related to the rescission of his National Academy of Sciences membership. The court reverses the dismissal of the defamation and false-light claims, holding that Castillo plausibly alleged actionable false statements, and remands for consideration of negligence. It affirms dismissal of the defamation-by-implication claim and the denial of further leave to amend.

Court
United States Court of Appeals for the District of Columbia Circuit
Writing for the Court
Ginsburg, Senior Circuit Judge; Henderson, Circuit Judge; Pan, Circuit Judge
Jurisdiction
United States Court of Appeals for the District of Columbia Circuit
Decision date
May 22, 2026
Docket number
24-7068; consolidated with 25-7001
Procedural posture
Consolidated appeal from Rule 12(b)(6) dismissals of defamation, false-light invasion of privacy, and defamation-by-implication claims.
Standard of review
De novo review of dismissal for failure to state a claim; abuse-of-discretion review of denial of leave to amend.
Precedential value
Published and precedential opinion of the D.C. Circuit
Parties
Luis Jaime Castillo Butters v. National Academy of Sciences, Marcia McNutt
Disposition
reversed_and_remanded

Topics

defamationinvasion of privacymotions to dismissappellate procedurecivil procedure

Practice areas

tortsdefamationprivacy lawcivil procedureappellate procedure

Questions Presented

  1. Whether Castillo plausibly alleged that the NAS and McNutt made false statements capable of defamatory meaning in stating that his membership was rescinded for violating the NAS Code of Conduct.
  2. Whether the same allegations plausibly stated a false-light invasion-of-privacy claim.
  3. Whether Castillo plausibly alleged defamation by implication based on McNutt's statement in the ScienceInsider article.
  4. Whether the district court abused its discretion by denying Castillo further leave to amend.

Holdings

  1. A plaintiff who alleges that he did not violate an organization's code of conduct plausibly alleges falsity of statements that he violated that code, even when the stated reason for the adverse action was in fact the code violation. The court held that Castillo adequately alleged that the October 13 and October 15 statements were false.
  2. The October 13 and October 15 statements were capable of a defamatory meaning because a reasonable reader could understand them as asserting that Castillo committed serious misconduct, including sexual harassment. The fact that the Code of Conduct also covered less serious conduct did not defeat that possibility at the pleading stage.
  3. Castillo failed to allege facts affirmatively suggesting that NAS or McNutt intended or endorsed a defamatory inference from McNutt's statement in the ScienceInsider article. The defamation-by-implication claim was properly dismissed.
  4. The district court did not abuse its discretion by denying Castillo's request for further leave to amend.

Key quotations

Because Castillo denied that he violated the Code of Conduct, he has effectively as well as expressly alleged that both the October 13 and October 15 statements were false. (8)
We hold both statements are capable of a defamatory meaning. (10)
To plead a plausible claim of defamation by implication under D.C. law, a plaintiff must “allege facts showing that . . . ‘the particular manner or language in which the true facts are conveyed’ supplies ‘additional, affirmative evidence suggesting’” such intent or endorsement. (15)

Factual background

Castillo, a professor of archaeology and international member of the National Academy of Sciences, lost his NAS membership after a former student publicly accused him of sexual harassment and filed a complaint with the NAS. The NAS informed members that an international member had been expelled for violating the Code of Conduct and later publicly announced that Castillo's membership had been rescinded for a Code of Conduct violation. ScienceInsider reported that a sexual-harassment investigation triggered Castillo's expulsion and quoted NAS President Marcia McNutt regarding members' professional-conduct obligations.

Procedural history

The district court initially dismissed Castillo's complaint without prejudice. It then dismissed the defamation and false-light claims in the First Amended Complaint with prejudice, dismissed the defamation-by-implication claim in the Second Amended Complaint, and denied further leave to amend. Castillo appealed the final dismissals, and the appeals were consolidated.

Remand instructions

The district court must allow the defamation and false-light claims to proceed beyond dismissal and determine in the first instance whether Castillo plausibly alleged that defendants acted negligently in publishing the statements. The dismissal of the defamation-by-implication claim remains affirmed.

Court Document

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