Forensic science fundamentally centers on detecting and interpreting clues, many of which are extremely small, easily degraded by environmental conditions, or intentionally concealed. Traditional forensic methods remain reliable and legally accepted; however, they increasingly struggle to address emerging forms of highly minute and complex evidence. In response, researchers are turning to nanotechnology to enhance forensic capabilities. Working at the nanoscale offers improved sensitivity, selectivity, and accuracy, enabling forensic scientists to detect, visualize, and analyze trace evidence with greater precision. This review examines the expanding role of nanotechnology across diverse forensic domains, including fingerprint visualization, gunshot residue detection, DNA analysis, document authentication, drug-related investigations, and postmortem interval estimation. Rather than suggesting that nanotechnology will replace established approaches, this article compares nanoscale methods with conventional techniques, highlighting their respective advantages, limitations, and practical considerations. Key challenges, such as validation, reproducibility, interpretation of results, and admissibility in court, are critically discussed. By assessing how nanotechnology can both support and complicate forensic workflows, this review provides a balanced perspective on its realistic contributions and shortcomings. Through integrating recent scientific advances with an understanding of forensic constraints, the article aims to clarify how nanoscale technologies may meaningfully strengthen forensic science while upholding the evidentiary standards demanded by the justice system.