Case law research is one of the most time-consuming and tedious legal tasks. Before generative AI: 2 to 4 hours to identify, read and synthesize relevant rulings on a given question, juggling Legifrance, Doctrine, Dalloz and Jurisclasseur. Today, combining Perplexity (multi-source search with citations) and Claude/GPT (intelligent synthesis), you can produce a solid case law note in 30-45 minutes. Major pitfall: hallucinations. AI can invent rulings or misquote them. This guide presents the rigorous workflow that secures usage while keeping productivity high.
Can AI invent rulings that don't exist?
Yes, major risk number 1. Several lawyers have been sanctioned (USA, Canada, France) for citing non-existent decisions generated by AI. Absolute rule: no ruling is usable unless its reference is verified in Legifrance, Doctrine, Dalloz or JurisData. Perplexity greatly reduces this risk by citing verifiable sources, but doesn't eliminate it.
What's the best source for case law in France?
For free research: Legifrance remains the official base. For enriched searches with commentary and doctrine: Dalloz and JurisClasseur (paid). For AI-augmented research: Doctrine AI and Predictice combine search + AI. For fast cross-source research: Perplexity (free or Pro 20$/month).
Can I use free Perplexity for client case law research?
For pure research (finding public rulings): yes, you're not submitting client data. For customized synthesis or analysis involving case details: no, prefer Perplexity Enterprise or an LLM in validated confidentiality mode (Claude for Work, ChatGPT Team).
How much time is really saved on case law research?
For simple case law research: 60-70% (from 2-3h to 30-45 min). For complete synthesis note on complex question: 50-60% (from 8-10h to 4h). Main gains are in raw search phase and first synthesis; validation, contextualization and advice stay human.