D.C. Circuit Revives Professor's Defamation Suit Over NAS Harassment Allegations
The D.C. Circuit has cleared Professor Castillo Butters' defamation lawsuit against the NAS to proceed.
Why it matters: This precedent clarifies how implied defamation claims involving institutional statements will be handled. It also highlights legal risks for organizations publicizing disciplinary decisions, especially regarding alleged sexual misconduct.
- On May 22, 2026, the D.C. Circuit allowed the defamation suit against the NAS to move forward.
- The case centers on whether NAS statements about Butters' membership revocation were impliedly defamatory.
- The District Court had previously dismissed the case, but the appellate court reversed.
- The dispute involves NAS Code of Conduct Section Four on discrimination, harassment, and bullying.
The U.S. Court of Appeals for the D.C. Circuit ruled on May 22, 2026 that Professor Luis Jaime Castillo Butters' defamation lawsuit against the National Academy of Sciences (NAS) may proceed, rejecting an earlier dismissal by the district court. The case centers on public statements by the NAS regarding the revocation of Castillo Butters’ membership, citing alleged violations under Section Four of its Code of Conduct, specifically concerning discrimination, harassment, and bullying.
The original lawsuit was filed on October 7, 2022, after NAS announced its disciplinary action against Butters. Castillo Butters claims these official statements implied he engaged in sexual harassment and discrimination, which he asserts is false and defamatory. U.S. District Court for D.C. had dismissed his claims in December 2024, concluding that the NAS communications were not defamatory as a matter of law.
The appellate court’s ruling emphasized that "a defamation by implication stems not from what is literally stated, but from what is implied," per Judge Douglas Ginsburg’s opinion. The D.C. Circuit found sufficient grounds to let Butters' claim be argued in court, especially over potentially implied falsehoods in institutional announcements.
This development highlights key risks for academic and other institutions making public allegations and disciplinary findings against members. It also underscores the emerging importance of defamation by implication in controlling reputational harm.
Read further details from Reason and full case documents via Justia.
By the numbers:
- May 22, 2026 — Date of key appellate decision
- December 3, 2024 — District Court dismissal date
- October 7, 2022 — Original lawsuit filed
Yes, but: Specifics of the D.C. Circuit's legal reasoning and the NAS's official response remain unavailable.
What's next: The case now returns to district court for litigation on Butters’ defamation-by-implication claims.