Background: In the current scenario, glass plays a vital contribution in our standard everyday life. Fractured and fragmented glasses are most commonly encountered at the crime scene. During the commission of the crime, glass breaks and shatters into fragments or into minute particles that serve as trace evidence and may provide a significant lead for the probe. The fracture of glass could be the consequence of an intentional act or unintentional act. For the forensic purpose, study of glass fractures, i.e., fractography has paramount importance as it can provide noteworthy data and encourages an assortment of assessments to investigate the case especially in the shooting cases where a firearm is used. Multiple fractures on a glass pane also have enough potential to establish an investigative link. Presently, air guns are being used in many of the cases due to their simple accessibility. There are a number of cases that have been reported that involved the use of air guns. Result: This study was conducted to evaluate the pattern of multiple fractures on the glass by the air rifle. For this purpose, glass panes of various thicknesses were test fired perpendicularly at a fixed range with an air rifle having round nose pellet. Measurements and analysis were made on some fixed parameter. Data was analyzed graphically and statistically to check the consistency in the trends. Conclusion: Consistency in the trends was observed, which is analyzed by the test for the goodness of fit. The findings of this work have provided some significant different perspectives that may effectively contribute to the criminal investigation.
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 00 (5.5 mm) and .177 00 (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.
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