Legion's Centurion Now Searches and Checks Case Law Through CourtListener on Every Matter

SAN JOSE, Calif. — October 15, 2026 — Legion today announced that Centurion, its AI assistant, is now available on every Legion matter and not only inside a draft. When an attorney asks for authority, Centurion searches published opinions in CourtListener, the Free Law Project's case-law database, confirms that a cited case exists there, and reads the opinion before it quotes from it. Every case it cites opens to the opinion inside Legion, with a link to the source on CourtListener.

When Legion introduced Centurion in April, it sat beside the draft on the Complaint, Answer, and Discovery workflows. It now sits in a panel beside the case files on every matter, and beside the document on every drafting step. From the matter panel, an attorney can ask Centurion to catch them up on the file, build the chronology, lay out the procedural history, spot inconsistencies across the documents, or start a draft from the chat. It cites the record to the page, and each cite opens the source document at that spot.

Research runs when the attorney asks for it. Centurion searches CourtListener by party name, subject, or phrase, and can narrow the search by court and date. Before a case citation goes into work the attorney will rely on, Centurion checks the citation against CourtListener and reports whether an opinion exists at that cite, with a link to the case. It reads the cases it relies on in full, and any language it quotes must come from that text. Clicking a case in the chat opens the opinion inside Legion, with the quoted passage highlighted when it can be found. A chat answer cannot link a case Centurion did not look up in that conversation; Legion rejects the answer and has Centurion rewrite it. If CourtListener lacks a case, Centurion searches the web and labels what it finds there as web-sourced and not CourtListener-verified. A case it cannot find anywhere stays out of the work product. On a Memorandum of Points and Authorities draft, one click runs a "Verify every authority" pass: Centurion checks each authority marked for verification, or not among the attorney's uploads, against the full opinion or the official text, fixes each place the brief cites it, and reports back.

Centurion confirms that a case exists and what it says. It does not check subsequent history, such as reversal, depublication, or negative treatment, and it tells the attorney so. That check stays with the attorney and the attorney's citator. The division fits SB 574 (Stats. 2026, ch. 858), signed September 30 and effective January 1, 2027, under which attorneys may not delegate the practice of law to generative AI and may not file citations they have not personally verified. Every case Centurion cites is one the attorney can open and read before signing.

Chat inside any draft is included in the document price. On the matter outside a draft, every matter starts with included credit, a quick question is usually a few cents, and the attorney sets the per-answer ceiling at which Centurion pauses and asks before it continues. Centurion is live today for all Legion customers on California, New York, and Illinois matters. Details are on the Centurion page at legion.law/solutions/centurion.