眼动追踪技术的基本原理及其在侦查辨认中的应用前景

辨认从心理学角度来讲是感知、记忆、再认的过程。通过眼动追踪技术可以实时采集辨认人在辨认过程中的眼动数据,了解其在辨认中的是如何思考及做出辨认结果的心理认知过程。利用眼动追踪技术,分析证人、犯罪嫌疑人辨认过程中的眼动模式,有助于研究证人辨认的准确率、识别犯罪嫌疑人、辅助发现破案线索等问题,在侦查辨认领域有广阔的应用前景。     

Simple and Sensitive Method for Identification of Human DNA by Allele-Specific Polymerase Chain Reaction of FOXP2

Abstract:  The forkhead box P2 ( FOXP2 ) gene is specifically involved in speech and language development in humans. The sequence is well conserved among many vertebrate species but has accumulated amino acid changes in the human lineage. The aim of this study was to develop a simple method to discriminate between human and nonhuman vertebrate DNA in forensic specimens by amplification of a human-specific genomic region. In the present study, we designed an allele-specific polymerase chain reaction (PCR) using primers to amplify smaller than 70-bp regions of FOXP2 to identify DNA as being of human or nonhuman, including ape, origin. PCR amplification was also successfully performed using fluorescence-labeled primers, and this method allows a single PCR reaction with a genomic DNA sample as small as 0.01 ng. This system also identified the presence of human DNA in two blood stains stored for 20 and 38 years. The results suggested the potential usefulness of FOXP2 as an identifier of human DNA in forensic samples.     

Application of DNA Forensic Techniques for Identifying Poached Guanacos (Lama guanicoe) in Chilean Patagonia*

Abstract: Guanaco (Lama guanicoe) is a protected and widely distributed ungulate in South America. A poacher, after killing guanacos in Valle Chacabuco, Chilean Patagonia, transported and stored the meat. Samples were retrieved by local police but the suspect argued that the meat was from a horse. Mitochondrial cytochrome b gene (774 pb), 15 loci microsatellites, and SRY gene were used to identify the species, number of animals and their population origin, and the sex of the animals, respectively. Analysis revealed that the samples came from a female (absence of SRY gene) Patagonian guanaco (assignment probability between 0.0075 and 0.0282), and clearly distinguishing it from sympatric ungulates (E‐value = 0). Based on the evidence obtained in the field in addition to forensic data, the suspect was convicted of poaching and illegally carrying fire arms. This is the first report of molecular tools being used in forensic investigations of Chilean wildlife indicating its promising future application in guanaco management and conservation.     

Molecular Identification of Indian Crocodile Species: PCR‐RFLP Method for Forensic Authentication*

Abstract: South East Asian countries are known for illegal poaching and trade of crocodiles clandestinely, to be used in skin, medicinal, and cosmetic industries. Besides crocodiles being listed in the Convention on International Trade in Endangered Species of Wild Fauna and Flora, India has its Wildlife Protection Act, 1972 for conservation of crocodile species. Hitherto, lack of any rapid and reliable technique for examinations of crocodile‐based crime exhibits such as skin, bones, etc. has been a major problem for an effective promulgation of law on illegal trade. DNA‐based identification of species using PCR‐RFLP technique for an apt identification of all the three Indian crocodile species namely, Crocodylus porosus, Crocodylus palustris and Gavialis gangeticus is presented here. A 628 bp segment of cytochrome b gene was amplified using novel primers followed by restriction digestion with three enzymes i.e., HaeIII, MboI, and MwoI, separately and in combination. The technique has produced a species‐specific pattern for identifying the three crocodile species individually, which fulfills the requirement for its forensic application. It is expected that the technique will prove handy in identification of all the three Indian crocodile species and strengthen conservation efforts.     

Individual Camera Identification Using Correlation of Fixed Pattern Noise in Image Sensors

Abstract:  This paper presents results of experiments related to individual video camera identification using a correlation coefficient of fixed pattern noise (FPN) in image sensors. Five color charge-coupled device (CCD) modules of the same brand were examined. Images were captured using a 12-bit monochrome video capture board and stored in a personal computer. For each module, 100 frames were captured. They were integrated to obtain FPN. The results show that a specific CCD module was distinguished among the five modules by analyzing the normalized correlation coefficient. The temporal change of the correlation coefficient during several days had only a negligible effect on identifying the modules. Furthermore, a positive relation was found between the correlation coefficient of the same modules and the number of frames that were used for image integration. Consequently, precise individual camera identification is enhanced by acquisition of as many frames as possible.     

Mug Shot Exposure Effects: Does Size Matter?

This research tested whether mug book size moderates mug shot exposure effects. Witnesses to a simulated theft searched either a small, a large, or no mug book, followed by a perpetrator-absent lineup containing a critical foil from the mug book. Contrary to predictions of a transference effect, critical foil lineup identifications did not differ across conditions. To test for a commitment effect, only participants who selected the critical foil in the mug book were considered; there was evidence of a commitment effect in the large mug book condition. Finally, there were more lineup-correct rejections in the large mug book condition; this was explained in terms of the criterion for making mug book choices carrying over to lineup choices.

我国工伤保险程序存在的问题及完善

工伤保险自诞生以来就具有强大的影响力,原因之一在于其程序简便易行。然而在我国,劳动者申请工伤保险待遇却要历经多重程序,耗时之长、过程之艰难已经成为工伤保险制度优越性发挥的障碍,为此,应以法律人本主义理念改革我国的工伤保险程序。     

大型灾难事件中的DNA鉴定工作

大型灾难事件通常是由各种无法预料的因素引发,并可造成大量人员的伤亡和失踪。法医学DNA实验室首要的任务就是对这些遇难者进行身份的认定。本文通过回顾大型灾难事件以及相关研究,提出大型灾难事件中DNA鉴定的程序,包括样品的准备、收集、贮存、DNA的提取、DNA的分型、相关数据的分析和结果的解释等,并对DNA鉴定中的经验和问题进行了讨论。     

汶川地震相关的若干刑事问题研究

"5.12"汶川地震发生后,出现了很多疑难刑事法律问题,如建筑物毁损责任追究问题、趁灾造谣、非法经营、灾民哄抢救灾物资等行为的定性问题等,对于这些问题,应当区分不同情形,作出相应处理。     

刑事案件DNA检验采样与鉴定立法现状

人类DNA遗传特征多态性使DNA技术成为各国警方侦办案件的重要技术手段,但DNA检验鉴定采样合法性和结论可采性须由立法规定。众多国家和地区针对DNA采样和鉴定结论应用制定了相关法律法规。我国相关法律细则尚处空白,因此,应尽快制定我国DNA鉴定采样与应用法规,规范DNA鉴定样本采集与证据采信。