无损磁光成像技术用于从钢板和枪支部件上恢复激光雕刻痕迹的评估

IF 1.9 4区 医学 Q2 MEDICINE, LEGAL
Bailey Henwood , Aimée Helliker , Rachael Hazael , Katherine Hewins
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引用次数: 0

摘要

《国际追查文书》是联合国会员国2005年通过的一份文件,其中概述了在追查非法武器方面面临的挑战,并提出了提高追查行动成功率的建议。ITI的一个关键条款规定,序列号如果被删除,必须是可恢复的。因此,这项研究调查了两种恢复钢上激光雕刻痕迹的方法,因为越来越多的枪支制造依赖激光来应用关键标记。这项工作使用了20块钢板(CR4级)、6个AK型步枪顶盖和一个钢制手枪滑盖来研究激光雕刻痕迹的可视化潜力。所有样品都使用BWM-30F光纤激光打标机进行了标记,此外手枪上还印有任何原始制造商的印记。使用研磨带(板)和Dremel®旋转工具(滑动盖和顶盖)去除所有标记,平均深度分别为1200µm(冲压)和240µm(激光雕刻)。尝试使用两种技术来恢复标记,以比较这两种技术恢复激光雕刻标记的能力;Regula Forensics®涡流恢复试剂盒,然后是传统的Fry试剂盒。两种回收技术都回收了手枪滑梯上100%(n=6)的冲压字符,以及手枪、顶盖和钢板上0%(n=509)的激光雕刻字符。建议法医枪械检查员避免试图使用Fry试剂回收激光雕刻的痕迹,以保持证据的完整性。还建议制造商避免在枪支上使用激光雕刻独特的识别标记,并使用更永久的方法,如冲压,以保持符合ITI等具有政治约束力的文件。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
An assessment of a non-destructive magneto-optical imaging technique for the recovery of laser engraved marks from steel plates and firearm components

The International Tracing Instrument (ITI) is a document adopted by United Nations Member States in 2005, which outlines challenges faced in the tracing of illicit weapons and offers suggestions to increase the success of tracing operations. A key provision of the ITI states that serial numbers must be recoverable if obliterated. This research, therefore, investigates two methods of recovering laser engraved marks on steel, due to the increase in firearms manufacturing relying on lasers to apply critical markings. This work uses 20 steel plates (CR4 grade), 6 AK-pattern rifle top covers, and a steel pistol slide to investigate the potential for visualising laser engraved marks. All samples had marks applied using a BWM-30F Fibre laser marking machine, in addition to any original manufacture’s stamped marks on the pistol. All marks were removed using a grinding belt (plates) and a Dremel® rotary tool (slide and top covers) to average depths of 1200 µm (stamped) and 240 µm (laser engraved). Recovery of the marks was attempted using two techniques to compare the two techniques in their ability to recover laser engraved marks; Regula Forensics® Eddy Current Recovery kit, followed by traditional Fry’s reagent. Both recovery techniques recovered 100 % (n = 6) of the stamped characters on the pistol slide, and 0 % (n = 509) of the laser engraved characters on the pistol, top covers and steel plates. Recommendations are made for forensic firearms examiners to avoid attempting the recovery of laser engraved marks using Fry’s reagent to preserve the integrity of evidence. It is also suggested that manufacturers avoid laser engraving unique identifying marks on firearms, and to use more permanent methods, such as stamping, to remain compliant with politically binding documents such as the ITI.

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来源期刊
Science & Justice
Science & Justice 医学-病理学
CiteScore
4.20
自引率
15.80%
发文量
98
审稿时长
81 days
期刊介绍: Science & Justice provides a forum to promote communication and publication of original articles, reviews and correspondence on subjects that spark debates within the Forensic Science Community and the criminal justice sector. The journal provides a medium whereby all aspects of applying science to legal proceedings can be debated and progressed. Science & Justice is published six times a year, and will be of interest primarily to practising forensic scientists and their colleagues in related fields. It is chiefly concerned with the publication of formal scientific papers, in keeping with its international learned status, but will not accept any article describing experimentation on animals which does not meet strict ethical standards. Promote communication and informed debate within the Forensic Science Community and the criminal justice sector. To promote the publication of learned and original research findings from all areas of the forensic sciences and by so doing to advance the profession. To promote the publication of case based material by way of case reviews. To promote the publication of conference proceedings which are of interest to the forensic science community. To provide a medium whereby all aspects of applying science to legal proceedings can be debated and progressed. To appeal to all those with an interest in the forensic sciences.
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