US judge sanctions litigant for hiding AI prompt injections in court filings

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Matthew Elliott, a self-represented plaintiff in a Connecticut lawsuit against New York Bariatric Group, embedded hidden text instructions — white text on a white background in 3pt font — inside his court filings, apparently targeting any AI system reviewing documents. Court clerks discovered the concealed text due to unusual spacing, and Judge Walter Spader Jr. confirmed that no Connecticut court uses AI to review filings, meaning the instructions had no effect. Despite causing no actual harm, Elliott was warned at a hearing but repeated the behavior, adding a YouTube link and mocking comments in subsequent filings. Judge Spader issued a 14-page order comparing the act to secretly communicating with a juror, ruling that the misconduct lies in the intent, not the outcome. As a sanction, Elliott lost electronic filing privileges and must now submit all documents in paper form directly to the clerk's office.

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