A Modified Electrostatic Adsorption Apparatus for Latent Fingerprint Development on Unfired Cartridge Cases

Visualization of latent fingerprints on metallic surfaces by the method of applying electrostatic charging and adsorption is considered as a promising chemical‐free method, which has the merit of nondestruction, and is considered to be effective for some difficult situations such as aged fingerprint deposits or those exposed to environmental extremes. In fact, a portable electrostatic generator can be easily accessible in a local forensic technology laboratory, which is already widely used in the visualization of footwear impressions. In this study, a modified version of this electrostatic apparatus is proposed for latent fingerprint development and has shown great potential in visualizing fingerprints on metallic surfaces such as cartridge cases. Results indicate that this experimental arrangement can successfully develop aged latent fingerprints on metal surfaces, and we demonstrate its effectiveness compared with existing conventional fingerprint recovery methods.     

声纹鉴定及其在侦查破案中的作用

随着科学技术的发展,利用手机、座机等现代通讯设备进行敲诈、勒索、恐吓、绑架、性骚扰等案件越来越多。声纹是通过声谱仪对语音纹理的描录,声纹鉴定是指通过声谱仪对未知人语音材料与已知人语音材料的语音学特征进行检测、比对和综合分析,以作出是否同一的判断过程。它能为确定案件性质、提供破案线索、印证其他证据、话者同一认定起到重要或决定性作用。     

谈轮胎印痕显现技术研究的现状

轮胎印痕是痕迹检验中经常遇到的一类痕迹。现有轮胎印痕显现手段的基本思路主要来自足迹的显现方法。文章介绍了当前轮胎印痕显现技术的现状及其存在的问题,并通过对比轮胎印痕与足迹之间的异同,提出对轮胎印痕应该有一套针对性的显现提取程序。