Why Semantic Search Alone Fails on Legal Text (And How Hybrid Search Fixed It)

I was building a RAG pipeline to classify AI systems under the EU AI Act — feed in a plain-English description of your AI system, get back the risk tier, the relevant articles, and a compliance checklist with citations. Classification was working perfectly. All 8 test scenarios nailed the correct risk tier. &#xA; But the confidence scores were stuck at 36% . &#xA; The problem wasn&rsquo;t the LLM.…