Forensic applications of 3D printing - a review of literature, case studies and future implications

The technological revolution has impacted every facet of life, including crime and law enforcement. Following the adoption of digital evidence, artificial intelligence, and CT scans, scientists and legal professionals have now turned to three-dimensional (3D) printing to present evidence more clearly in a court of law. 3D printing is a process of creating physical objects by depositing materials layer by layer, based on digital models, to form solid, tangible replicas. It has a wide range of applications across various fields of forensic science, including explosives analysis, ballistics, forensic medicine, forensic archaeology, and crime scene reconstruction. 3D printed impression evidence such as tire marks, and shoe prints etc., offers more detailed and accurate representations compared to traditional methods. Similarly, 3D printed crime scene reconstructions provide immersive and precise visualizations, enhancing their reliability and utility in forensic investigations. This article discusses the steps involved in 3D printing, the types of 3D printing technologies, its applications in various forensic examinations, and real-world criminal cases that highlight the significance of 3D printed evidence in judicial decision-making. 3D printing has proven instrumental in these cases for establishing the linkage of weapons to crimes and correlating injuries to weapons, and identifying charred or mutilated remains. However, like any emerging technology, 3D printing in forensics faces certain challenges, which need to be addressed to maximize its potential. These include standardized protocols, ethical considerations, and high initial setup costs-all of which must be addressed to fully realize its potential.