The incorporation of quantum computing into digital systems presents substantial challenges for the legal framework, particularly in assessing the reliability and admissibility of digital evidence. Quantum principles such as superposition and entanglement introduce intrinsic uncertainty in data states, potentially undermining the integrity of digital evidence. This paper proposes a theoretical model, the Quantum Integrity Score (QIS), aimed at assessing the reliability of digital evidence in the quantum era. The QIS evaluates key factors, including encryption robustness, data consistency, and the impact of quantum entanglement, to generate a trustworthiness score. As quantum computers can potentially break classical encryption systems and introduce non-local correlations, the QIS offers a practical approach to measure and present the level of uncertainty associated with digital evidence. By incorporating the QIS into legal processes, this framework aims to provide a clear understanding of how quantum effects could influence digital trials. This approach allows legal professionals to assess digital evidence in a more informed and systematic way, ensuring that justice remains intact despite the uncertainties introduced by quantum technologies.