[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"branding":3,"analytics":7,"article-researchers-teach-legal-ai-to-stop-citing-outdated-law":10,"sections":34},{"siteName":4,"siteTagline":5,"publisherName":4,"contactEmail":6},"The Revision","Tech news, decoded.","editor@therevision.news",{"gaMeasurementId":8,"adsenseClientId":9},"G-ZW2MV82GYR","ca-pub-8533917693782264",{"article":11},{"id":12,"slug":13,"title":14,"dek":15,"body_md":16,"tags_json":17,"published_at":18,"created_at":19,"updated_at":20,"status":21,"review_note":22,"review_notes":23,"image_url":22,"persona_id":22,"persona_name":22,"section":24,"tags":25,"sources":29,"feedback":33,"feedback_at":22,"cost_usd":33,"total_tokens":33},7424,"researchers-teach-legal-ai-to-stop-citing-outdated-law","Researchers Teach Legal AI to Stop Citing Outdated Law","LegalSearch-R1 pairs statute lookup with web search and reinforcement learning to keep legal AI from applying laws that no longer apply.","A new research system teaches AI legal assistants to check the calendar before citing a law.\n\nResearchers built LegalSearch-R1, an AI agent that combines a local database of statutes with web search, trained using reinforcement learning on legal text tagged by date across multiple amendment periods. The goal: stop large language models from citing laws that were true when the model was trained but have since been repealed or amended, a failure mode the researchers call temporal bias. In tests across 13 legal tasks, the 7-billion-parameter system beat existing deep-research frameworks and specialized legal AI models by 12.9% to 29.8%, and beat baseline systems by 57.7% to 80.3% specifically on temporal consistency, meaning it applied the version of a law that was actually in force when a case occurred. The team also found that web search alone could not reliably produce the precise statute and precedent citations legal reasoning requires, which is why they paired it with a dedicated local retrieval system for the legal text itself.\n\nLegal AI tools live or die on getting citations right, and an assistant that confidently cites a repealed statute is worse than one that admits uncertainty. This is a narrow, unglamorous fix, but it targets a real failure mode common to any LLM trained on a fixed cutoff: the world keeps changing after the training data stops.\n\nThe code and benchmark are open on GitHub, so expect other legal-tech vendors to borrow the trick rather than reinvent it.","[\"ai\",\"legal-tech\",\"reinforcement-learning\",\"llm-research\"]","2026-09-23T04:00:00.000Z","2026-09-23T12:49:48.978Z","2026-09-23T12:50:00.764Z","published",null,[],"ai",[24,26,27,28],"legal-tech","reinforcement-learning","llm-research",[30],{"name":31,"url":32},"arXiv cs.AI","https:\u002F\u002Farxiv.org\u002Fabs\u002F2605.25920",0,{"sections":35},[36,40,44,49,54,59,64,69,74,79,84,89,94,99],{"name":37,"slug":24,"count":38,"latest_published_at":39},"AI",4347,"2026-09-23T12:00:00.000Z",{"name":41,"slug":42,"count":43,"latest_published_at":18},"Security","security",713,{"name":45,"slug":46,"count":47,"latest_published_at":48},"Policy","policy",371,"2026-09-23T12:00:43.000Z",{"name":50,"slug":51,"count":52,"latest_published_at":53},"Deals","deals",212,"2026-09-23T13:00:46.000Z",{"name":55,"slug":56,"count":57,"latest_published_at":58},"Hardware","hardware",170,"2026-09-23T11:59:23.000Z",{"name":60,"slug":61,"count":62,"latest_published_at":63},"Science","science",134,"2026-09-23T09:00:00.000Z",{"name":65,"slug":66,"count":67,"latest_published_at":68},"Consumer Tech","consumer-tech",110,"2026-09-22T20:00:00.000Z",{"name":70,"slug":71,"count":72,"latest_published_at":73},"Software","software",81,"2026-09-23T09:56:13.000Z",{"name":75,"slug":76,"count":77,"latest_published_at":78},"Dev Tools","dev-tools",79,"2026-09-22T22:21:13.000Z",{"name":80,"slug":81,"count":82,"latest_published_at":83},"Startups","startups",65,"2026-09-22T22:06:48.000Z",{"name":85,"slug":86,"count":87,"latest_published_at":88},"Gaming","gaming",45,"2026-09-22T15:35:06.000Z",{"name":90,"slug":91,"count":92,"latest_published_at":93},"General","general",43,"2026-09-21T23:48:56.000Z",{"name":95,"slug":96,"count":97,"latest_published_at":98},"Reviews","reviews",27,"2026-09-22T13:00:00.000Z",{"name":100,"slug":101,"count":102,"latest_published_at":103},"How-To","how-to",6,"2026-06-16T09:00:00.000Z"]