Alim Md, Negi Kailash Singh, Abhyankar Sughosh, Tiwari Neelesh, Harshey Abhimanyu, Srivastava Ankit
Dr. A.P.J. Abdul Kalam Institute of Forensic Science and Criminology, Bundelkhand University, Jhansi 284128, Uttar Pradesh, India.
Heliyon. 2020 May 31;6(5):e04088. doi: 10.1016/j.heliyon.2020.e04088. eCollection 2020 May.
Scientific examination of the physical evidence provides significant information beyond a reasonable doubt. Due to the increasing use of the glassy polymer i.e. polymethylmethacrylate instead of glass, the probability of the occurrence of the fractured polymethylmethacrylate sheet in a shooting incident cannot be ignored. Analysis of fracture pattern offers several analytical approaches that assist the forensic investigator. The use of air guns in criminal activities is increasing as well as these weapons have found to be fatal for living beings. This study was conducted to evaluate the fracture pattern on the polymethylmethacrylate by using an air rifle. The fracture pattern formed on polymethylmethacrylate sheets by the air guns shows some specific characteristics that may help to reconstruct the crime scene. The polymethylmethacrylate sheets were test-fired with Spring-Piston air rifles of .22″ (5.5 mm) and .177″ (4.5 mm). Data obtained from the measurements were then statistically analysed with the Chi-Square test. A consistency in hole diameter was observed. Analysis of fracture patterns may provide a lead to the investigator and may help to reconstruct a shooting incident. It can also distinguish between the standard firearm and air gun. The fracture on polymethylmethacrylate sheets gave significant findings that may efficaciously contribute to the forensic investigation of shooting incidences.
对物证进行科学检验能提供确凿无疑的重要信息。由于越来越多地使用玻璃状聚合物即聚甲基丙烯酸甲酯来替代玻璃，在枪击事件中出现聚甲基丙烯酸甲酯薄板破碎的可能性不容忽视。对破碎模式的分析提供了几种有助于法医调查人员的分析方法。气枪在犯罪活动中的使用日益增加，而且这些武器已被发现对生物具有致命性。本研究旨在通过使用气步枪来评估聚甲基丙烯酸甲酯上的破碎模式。气枪在聚甲基丙烯酸甲酯薄板上形成的破碎模式呈现出一些特定特征，这可能有助于重建犯罪现场。使用.22英寸（5.5毫米）和.177英寸（4.5毫米）的弹簧活塞式气步枪对聚甲基丙烯酸甲酯薄板进行试射。然后，使用卡方检验对从测量中获得的数据进行统计分析。观察到孔径具有一致性。对破碎模式的分析可能会为调查人员提供线索，并有助于重建枪击事件。它还可以区分标准枪支和气枪。聚甲基丙烯酸甲酯薄板上的破碎产生了重要发现，这可能会有效地推动对枪击事件的法医调查。
