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41.
Norimitsu Akiba Ph.D. Kenro Kuroki Ph.D. Kenji Kurosawa Ph.D. Ken'ichi Tsuchiya Ph.D. 《Journal of forensic sciences》2018,63(2):556-562
Detection of aged fingerprints is difficult because they can degrade over time with exposure to light, moisture, and temperature. In this study, aging fingerprints were visualized by time‐resolved spectroscopy with an ultraviolet‐pulsed laser. Fingerprints were prepared on glass slides and paper and then stored under three lighting conditions and two humidity conditions for up to a year. The fluorescence intensities of the fingerprints decreased with time. Samples were stored in the dark degraded less than in sunlight or under a fluorescent lamp. Samples were stored under low humidity degraded less than under moderate humidity. As the storage period increased, a fluorescence emission peak appeared that was at a longer wavelength than the peak visible in earlier spectra. This peak was used for visualization of an aged fingerprint over time. An image of the fingerprint was not initially visible, but an image appeared as the time since deposition of the fingerprint increased. 相似文献
42.
通过对CNAS-T18指印项目实施与结果的解析,讨论了当前国内利用指印印面特征的现状:民事案件指印鉴定基础理论的不足。提出了对民事案件指印特征重新进行分类研究,以及探讨、规范利用指印印面特征步骤、方法的必要性和紧迫性。强调了指印印面特征在解决民事案件中的重要作用。 相似文献
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随着新刑事诉讼法修改案的实行,法律赋予了犯罪嫌疑人更多人权的同时,给公、检、法机关的工作提出了更高的要求,并就证据的形式,证据的获取途径以及证据链等关于证据的法律效力方面做出了严格的规定和要求。随着社会的发展,各种形形色色的案件层出不穷,而真正留在现场的完整指印将少之又少,如何对现场手印进行分析和判断为侦查提供重要线索,文章结合实践总结出对现场手印分析的工作步骤和方法,以便锁定犯罪嫌疑人成为法庭审判予以采信的重要物证同时也能成为犯罪情报资料的重要来源。手印作为七种证据之一,在今后的打击犯罪和参与刑事诉讼方面仍将发挥重要作用,因此研究手印仍具有实战指导意义。 相似文献
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现场勘查中,技术人员对用粉末刷显的手印、灰尘加层手印拍照提取后,再用新型手印提取器提取效果更好。手印提取器使胶带与客体接触面积变小、压力均匀,从而避免在提取过程中产生气泡;同时,胶带具有粘性的一面与另一胶带紧密相粘,通过转动,能制成透明的手印检材,可直接通过印相放大、复印,或通过反差较大的衬底做背景进行比对鉴定。实践证明,运用手印提取器提取的手印具有高质量、手印特征反映好、保存时间长,而且在使用中方便简捷,提取速度快等优点。 相似文献
48.
《Science & justice》2020,60(2):160-168
The enhancement of fingermarks on thermal paper can be challenging due to background staining caused by polar solvents used in fingermark enhancement techniques such as ninhydrin. This study explored a commercial one-step superglue fuming process, Lumicyano™, and Vacuum Metal Deposition (VMD) to develop fingermarks on this substrate and overcome this issue. Different sequential treatments involving Lumicyano™ and a combination of VMD methods were investigated with varying degrees of success with some sequences being highly sensitive. The VMD processes, however, were observed to generally be more effective at enhancing marks, whereas Lumicyano™ provided little or no benefit on this paper type. The results indicate that Lumicyano™ is only beneficial as a pre-treatment when the entire sequence of gold/zinc and silver/zinc is taken to completion. The gold/zinc and silver/zinc VMD processes were optimised on five different thermal papers, and the optimised techniques were then directly compared to determine which was more successful on each thermal paper type as a single treatment. 相似文献
49.
Kevin J. Farrugia Ph.D. Danielle Hunter B.Sc. Clarice Wilson B.Sc. Stef Hay B.Sc. Paul Sherriffs B.Sc. Paul Deacon B.Sc. 《Journal of forensic sciences》2020,65(1):248-254
This study presents a number of pseudo-operational trials on plastic bags investigating the double- and co-fuming process of a one-step fluorescent cyanoacrylate (LumicyanoTM) in comparisons with the two-step process with basic yellow 40 (BY40) staining for the detection of latent fingermarks. The results demonstrate that both Lumicyano solution and dye contribute to the increased detection of latent fingermarks during the double-fuming process (trial 1). Co-fuming the Lumicyano solution and dye separately (at a concentration of 8%) but simultaneously was less effective than 8% Lumicyano (trial 2). Co-fuming Lumicyano 8% and an additional 8% Lumicyano dye by weight was more effective than Lumicyano 8% (trial 3), possibly due to increased fluorescent material deposition during co-fuming allowing for better visualization. The use of BY40 after Lumicyano resulted in a considerable increase in detected fingermarks. 相似文献
50.
目的:针对公安实践工作中经常遇到的问题,利用短波紫外反射照相提取曲面客体上的潜在指印,为曲面客体上的指印提取提供技术参考。方法:利用环形短波紫外灯小角度照射曲面客体,通过固定曲面客体使之仅沿中心轴线方向旋转,依次拍照记录,再导入Photoshop cc中通过图像拼接技术获得完整的指纹图片。结果:总结相机参数设置、曲面客体所产生的反射光斑以及曲面畸变对成像结果的影响,得出一套优化的拍摄方案。结论:曲率对拍摄难度、拼接难度、成像结果有着直接的影响,曲率越大,需要拍摄的照片数量越多,光斑遗留痕迹越严重,成像结果越差。 相似文献