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What was Johnson v. Dunn and what does it mean for AI legal tools?

Johnson v. Dunn is among the cases in the 2024-2025 wave where a court confronted AI-generated fabricated or unsupported citations in filings and imposed consequences on counsel — reinforcing that using an AI tool does not excuse the lawyer's duty to verify…

register 09 · Compliance pins· AI Citation Sanctions
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Answer.

Evidence / professional-responsibility rule · AI Citation Sanctions.

Johnson v. Dunn is among the cases in the 2024-2025 wave where a court confronted AI-generated fabricated or unsupported citations in filings and imposed consequences on counsel — reinforcing that using an AI tool does not excuse the lawyer's duty to verify what they file. The lesson is that responsibility stays with the lawyer. Planisphere measures how an AI tool behaves but does not check citations; verifying legal authorities before filing remains counsel's job, and this is not legal advice.

Cite-anchor: AI hallucinated-citation sanctions — Rule 11 / Rule 9011 certification and MR 3.3 candor · Fed. R. Civ. P. 11; Fed. R. Bankr. P. 9011; ABA Model Rule 3.3; exemplar Johnson v. Dunn (N.D. Ala. 2025)

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The mark behind the answer.

AI Citation Sanctions sets the bar an AI output must clear before a tribunal or a client relies on it — reliability, can…

hallucinated-authority sanctions wave · Rule 11 / 9011 · candor-to-tribunal.

→ Full reference for AI Citation Sanctions

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More on AI Citation Sanctions.

Other questions this mark answers.
Can I be sanctioned for AI-hallucinated citations? Does having an AI policy protect my firm from sanctions? How do I verify AI legal research before filing?

Try AI Citation Sanctions with a free test key.

Start with the free sandbox. Planisphere measures model behaviour and emits a reproducible, sha-pinned record — it does not certify, file, or give legal advice.

Open the Console Prepare evidence for legal AI review AI Citation Sanctions reference
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When AI Citation Sanctions asks for proof, hand over records — not assurances.

record the duty · seal the receipt · verify offline

Planisphere records each duty event — an output marked, a disclosure shown, a review made — and seals it into a receipt that verifies offline against our published keys. You send hashes, never content. A record is evidence a third party can check; it is not a certification and not a legal determination.

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See how a record is checked · See the law Toolkit →