An Advanced RAG - Based Pipeline for Precise Legal Information Retrieval

Sarath Babu Poovassery Krishnan

Abstract: Efficient retrieval of relevant information from large volumes of legal documents is both critical and challenging in the legal domain. Large language models (LLMs) offer a transformative opportunity to enhance the efficiency of legal research by enabling natural language - based interfaces for precise information retrieval. Among emerging techniques, Retrieval - Augmented Generation (RAG) has gained prominence as a powerful tool for information retrieval. However, basic RAG methods often fall short of meeting the specific needs of legal professionals in identifying accurate and contextually relevant information. This paper examines the limitations of existing RAG pipelines and proposes an enhanced RAG pipeline tailored for legal information retrieval, designed to improve both accuracy and relevancy. Our approach integrates a multi - layered chunking strategy, enhanced metadata annotations, a hybrid search mechanism that combines sparse and dense vector embeddings within a vector database. To refine query understanding, we employ query expansion techniques and dynamically apply metadata filters. Implementing these approaches can significantly enhance retrieval quality, thereby improving the overall effectiveness of legal information retrieval.

Keywords: Legal Information Retrieval, Retrieval - Augmented Generation (RAG), Large Language Models (LLM), Legal Research Automation, Hybrid Search, Multi - layered Chunking, Query Expansion, Metadata Annotation, Embedding Fine - tuning, Semantic Search, Re - ranking Algorithms, Answer Faithfulness, Context Relevance, Case Law Retrieval

How to Cite?: Sarath Babu Poovassery Krishnan, "An Advanced RAG - Based Pipeline for Precise Legal Information Retrieval", Volume 14 Issue 5, May 2025, International Journal of Science and Research (IJSR), Pages: 1246-1252, https://www.ijsr.net/getabstract.php?paperid=SR25519041742, DOI: https://dx.doi.org/10.21275/SR25519041742