TRACING THE TRUTH: PRESERVATION AND DOCUMENTATION OF TOOLMARK EVIDENCE IN FORENSIC INVESTIGATIONS
AUTHOR – VANMATHI N, STUDENT AT TAMILNADU DR. AMBEDKAR LAW UNIVERSITY
BEST CITATION – VANMATHI N, TRACING THE TRUTH: PRESERVATION AND DOCUMENTATION OF TOOLMARK EVIDENCE IN FORENSIC INVESTIGATIONS, INDIAN JOURNAL OF LEGAL REVIEW (IJLR), 5 (14) OF 2025, PG. 587-601, APIS – 3920 – 0001 & ISSN – 2583-2344.
CHAPTER-1
1.1 Introduction
In the realm of forensic science, toolmarks, the impressions or scratches left by tools on surfaces, are among the most compelling forms of physical evidence. Whether in cases of burglary, sabotage, or homicide, these marks can link a specific tool to a crime scene through unique wear patterns and microscopic imperfections. This ability to individualize a tool makes toolmarks powerful in criminal investigations[1]. Yet, despite their evidentiary strength, toolmarks often receive less attention than fingerprints or DNA, even though they can help reconstruct events and reveal criminal intent.
In India, the significance of toolmarks has gained renewed focus with the enactment of the Bharatiya Nagarik Suraksha Sanhita 2023, which replaces the colonial-era Criminal Procedure Code. Under Section 106 of the BNSS, physical evidence like toolmarks must be scientifically documented and preserved to be admissible in court[2]. This aligns with Article 21 of the Constitution, which guarantees due process and procedural fairness in criminal trials[3].
Preserving toolmarks depends on the surface and type of mark. Common methods include high-resolution photography, silicone-based casting, and electrostatic lifting. Documentation, on the other hand, involves structured forensic reports, laboratory comparisons, and crime scene sketches. These practices are expected to follow international standards such as those set by the Association of Firearm and Toolmark Examiners[4] and ISO 17025 accreditation protocols [5].
However, challenges persist. Many regional forensic labs in India lack access to advanced tools like 3D laser profilometers, and inconsistencies in documentation can jeopardize the integrity of evidence. Moreover, the absence of a centralized toolmark database hampers case comparison and judicial consistency. Addressing these gaps is not just a matter of forensic precision, it is essential for upholding constitutional justice and human rights, especially in custodial investigations. This study explores the legal admissibility of toolmarks under the BNSS and the Bharatiya Sakshya Adhiniyam[6], critically evaluates current scientific practices for their preservation and documentation, and proposes reforms based on comparative legal systems. Strengthening the role of toolmarks in forensic reconstruction and courtroom decision-making requires standardized protocols, digital preservation, and greater judicial awareness.
[1] Peterson, J., & Sommers, I. (2010). Forensic Evidence and Criminal Justice: Toolmarks and Their Role in Investigations. Journal of Forensic Sciences, 55(2), 345–356
[2] Bharatiya Nagarik Suraksha Sanhita, 2023, Section 106. Government of India Gazette Notification.
[3] Constitution of India, Article 21 – Protection of Life and Personal Liberty.
[4] Association of Firearm and Toolmark Examiners (AFTE). (2023). AFTE Glossary and Standard Protocols for Toolmark Examination. AFTE Journal, 55(3), 210–225.
[5] ISO/IEC 17025:2017. General Requirements for the Competence of Testing and Calibration Laboratories. International Organization for Standardization; UK Forensic Science Regulator. (2024). Codes of Practice and Conduct for Forensic Science Providers.
[6] Bharatiya Sakshya Adhiniyam, 2023. Government of India Gazette Notification.
→ Governs admissibility of evidence in Indian courts, including toolmarks.