Abstract
<p style="text-align: justify;"><span style="font-family: "times new roman";">In recent years, with the continuous emergence of urban security problems, people have begun to focus on the development and research of police weapons. However, there is currently no reliable method for detailed analysis of the performance of police 9mm revolver pistols. In order to conduct an in-depth analysis of the performance of the police revolver, this study selected a police 9 mm revolver and ordinary bullets to test the car steel plate from a firing distance of 15cm, 30cm, 45cm, 60cm, 1m, 1.5m and 3m, respectively. In this paper, gunshot residue (GSR) was collected from four places, and the morphology of gunshot residue particles was observed using a scanning electron microscope (SEM). Different shooting distances have a negative correlation with the distribution density of gunshot residues. The gunshot residue particles can be measured at close range, and a small amount of warhead particles can still be found at a long distance. There are more gunpowder particles when shooting at close range, and more warhead particles when shooting at long range. Even the samples at the paint peeling off the bullet holes of the automobile steel plate can detect the particles of the gunshot residue. Therefore, under the cross-comparison between the sample extracted on the suspected bullet hole and the sample in the shell, the particle analysis can not only confirm whether it is a bullet hole, but also infer the shooting distance.</span>
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