The Documented Problem With AI-Drafted Legal Citations
Attorneys who used ChatGPT, Gemini, or Claude to assist with legal research and drafting have, in multiple documented incidents, submitted court filings containing citations to cases, articles, or sources that do not exist. These tools generate citation-shaped text by pattern-matching against their training data rather than retrieving from a live legal database, which means a fabricated citation can be formatted perfectly while referring to nothing real — the same underlying failure mode documented across academic and general reference citation generation.
Courts in multiple jurisdictions have addressed this directly, including sanctions and published opinions specifically addressing attorney use of AI-generated content without verification. The American Bar Association and several state bar associations have issued guidance on the duty to verify AI-assisted legal research before submission.
What This Tool Checks, Precisely
This tool applies the same five-field structural check used across the rest of this site — author, year, title, source, and identifier (DOI or URL) — to reference-style citations. This is directly relevant to the secondary sources legal documents frequently cite: academic articles and law review pieces cited in support of an argument, government and regulatory reports, books, and expert reports with identifiable authorship and publication information.
A reference missing a verifiable identifier is flagged the same way it would be in an academic paper, which is useful signal for exactly the kind of citation ChatGPT, Gemini, or Claude can generate convincingly but inaccurately — a law review article that sounds plausible but doesn't resolve to a real publication.
What This Tool Does Not Check — Case Law Citations
Case law citations follow Bluebook format (in the US) or OSCOLA (in the UK and several other jurisdictions) — a structurally different citation system built around case name, reporter, volume, page number, court, and year, rather than the author-year-title-source-identifier structure this tool is built to parse. A fabricated case citation — Smith v. Jones, 410 U.S. 113 (1973), where no such case exists — will not be reliably flagged by this tool, because the structural pattern it's checking for doesn't map onto how case citations are constructed.
Verifying case law citations requires checking the cited case directly in a legal database — Westlaw, Lexis, or Google Scholar's case law search are the standard tools for this — confirming the case exists, the citation format is accurate, and the case actually supports the proposition it's cited for. There is no structural shortcut for this verification; it requires looking the case up.