微生物物证检验

面对21世纪生物犯罪或生物恐怖活动的新挑战,物证鉴定的新专业--微生物物证检验将成为执法部门侦查和起诉生物犯罪必不可少的手段。微生物物证检验以用作犯罪武器的各种微生物为检验对象,获得微生物种类和能够提供来源信息的菌毒株细致分型结果,达到提供犯罪侦查线索和法庭证据的目的。本文综述了微生物物证检验的定义、特征、技术应用以及美国近年来在微生物物证检验的实践和值得借鉴的成功经验。并建议我国物证鉴定实验室应积极开展研究,建立能够满足生物犯罪侦查需求的微生物物证检验能力。     

电子物证检验

目的阐述电子物证检验技术的专业内容和组成,以及开展电子物证检验的作用和重要意义;方法研究美国、欧洲和国内电子证据及其检验鉴定的数据资料,结合国内物证检验技术发展现状和需求,论证电子物证检验技术;结果提出了电子物证检验定义、检验对象、技术方法、特点作用以及尽快在国内建立电子物证检验专业等观点;结论电子物证检验是关于识别、发现、提取、保存、恢复、展示、分析和鉴定电子设备中存在的电子信息(电子证据)的科学技术,其检验结果可以作案件侦查线索或法庭证据。开展电子物证检验可以有效提高犯罪侦查效率。     

刍议物证与物证特征的系统分类

为了全面认识所有反映＂人＂的信息物证和所有反映＂物＂的信息物证,从反映物证系统的核心的内在规律入手,依据物证反映信息的本质对物证进行了分类,并依据现代系统科学中的＂中观方法论＂原则,对物证特征进行了系统分类。以期有利于检验鉴定人员对物证特征系统多方面、深层次进行认识,提取更多的信息,提升案件的检出率和准确率,同时也为建立系统检验鉴定量化模型,提供更加科学、精确的评判依据。     

植物DNA检验技术在命案现场重建中的应用策略

植物DNA检验技术是利用植物遗传性状的稳态性对关联植物物证进行检验鉴定的手段。将该技术应用于现场重建,应基于植物物证与犯罪嫌疑人、被害人及其活动环境具有＂重大关联性＂。从命案现场重建的需求上看,应围绕犯罪嫌疑人及其可控物品中附着植物与现场植物的种属同一性判断、被害人尸体（尸块或尸骸）及其随附物品中附着植物与中心现场植物的种属同一性判断、疑似侵害物及其附着植物与嫌疑人行为关联植物的种属同一性判断等三个角度或层次进行检验和综合分析。植物DNA检验技术可阐明物证的时空运行停顿规律,为命案现场重建工作提供一种参考性解决方案。     

物证鉴定错误减少对策研究

物证鉴定若存在错误风险则会危害严重。恰当的物证鉴定错误管理可以有效减少物证鉴定错误的发生,有助于及时发现物证鉴定错误并将损害减至最小。本文探讨了在物证鉴定全部过程中有效管理物证鉴定错误的十二条措施:1)以有组织方式有条理的开展物证发现、提取、标记、记录、包装、保存和送检工作;2)持续强化物证鉴定科学基础研究和方法确认;3)在物证鉴定检验过程中实施多人平行鉴定、技术评审和管理审核程序;4)建立透明的鉴定意见冲突解决和鉴定结论表述机制;5)采用适当程序和方法有效管理和控制物证鉴定认知偏见信息;6)实施物证鉴定结论例行核查机制;7)建立检验留样和全面记录机制;8)有效评估物证鉴定结论错误风险;9)建立有效的用户培训和交流机制;10)及时发现和整改物证鉴定错误;11)构建物证鉴定科学文化;12)加强物证鉴定人培训。     

手机物证检验及其在刑事侦查中的应用

随着移动通信技术的迅速发展和广泛应用,手机内部包含的信息已经成为犯罪侦查重要的线索和证据来源。采用专门的符合物证鉴定原理要求的技术方法检验手机的SIM卡存储器、主板存储器和闪存卡,可以获得大量的手机使用者个人信息、通信内容信息、通信发生信息、使用者写入存储信息和手机设置信息等大量信息资料。手机检验结果给出的这些信息具有非常高的侦查和证据价值的,手机也因此成为物证鉴定领域内一个新的检验对象。     

指印检验新方面

100多年来指印鉴定一直是犯罪侦查最有效的个体识别手段,在物证鉴定领域占据重要地位,上世纪80~90年代指印检验技术研究的重要进步更是使指印物证技术应用达到一个新的水平。最近几年指印技术研究又取得许多新进展和突破,特别是在指印显现技术和指印纹线物质成分分析方面开创了新方法和新方向,形成指印物证应用新体系,但同时在指印鉴定结论可靠性方面也出现新争议。     

我国物证鉴定的现状与对策

物证鉴定技术是刑事科学技术工作的重要组成部分,是公安机关不可或缺的基础性工作和重要科技支撑,是维护司法公正和社会稳定的重要手段。笔者对目前我国物证鉴定技术发展现状及发展过程中出现的问题,以及如何推进物证鉴定技术专业化、规范化、信息化、现代化,加快提高我国物证检验鉴定能力     

浅谈微量物证的提取、保存和送检要求及意义

物证是刑事技术的重要组成部分，它的存在已显示出在各类案件中的巨大应用价值，其鉴定结论作为法庭的重要证据之一。物证的种类所涉及的专业各不相同，各专业又涉及不同的鉴定项目，每个鉴定项目对物证检材及比对样品又有着各自特殊的要求。检材的提取是否规范，保存是否妥当都将直接影响到最终的鉴定结果，微量物证经过检验所提供的信息一旦被证实，便是揭露和证实犯罪的强有力的证据。在理化检验工作中，我们接触的物证种类繁多，在送检样品中经常遇到各种各样的问题，如：不规范的包装、提取方法和送检方法不当、数量和质量不符合要求等…     

物证鉴定的技术方法确认和标准操作规程

物证鉴定中使用的技术方法直接影响和决定了物证检验结果的质量,因此对技术方法的管理是物证鉴定实验室质量保证体系的核心因素之一。开展技术方法的开发确认和内部确认并建立方法的标准操作规程,是保证实验室能够正确选择和使用科学可靠的技术方法,并获得一致结果的主要手段。运行高水平质量保证体系的物证鉴定实验室,应该在案件物证检验工作中使用经过实验室内部确认的技术方法,而且重要新技术方法还应在开发确认基础上进行内部确认,根据方法确认结果建立该方法的标准操作规程。     

RNA在法医学中的研究应用进展

长期以来,RNA由于其自身的不稳定性、易降解的特征未受到法医学者的关注。近年来,随着定量PCR等分子生物学技术的改进与发展,RNA分析逐渐开始在法医学实验室中开展起来。RNA可用于死亡时间、创口形成时间、斑痕形成时间的推测,并且可取代传统的血清酶学检测用于确定体液类型并扩大了检测范围,还可以辅助诊断细胞或器官的功能状态。本文就近年来RNA在法医学的研究应用进展做一概述。     

The catalyst-like role of forensic genetics in the developmental process of Hungarian wildlife forensics

The anthropocentric nature of forensic sciences has been changing continuously over the years and this process is continuing today. Due to its universality and multilateral implementation, and the fragmented nature of forensic epistemology, the information provided by forensic genetics can play a pivotal role in forensic science. At the same time, the link between forensic genetics and non-human forensic biological evidence has become unquestionable. It may highlight the modern requirements of forensic science, and this connection is also able to provide useful and sufficient examples for developmental processes in wildlife forensics. Obviously, the local formations, organizations, and operations of wildlife forensics can be different worldwide, but the detection and punishment of wildlife-related criminal behavior, as well as the prevention of further crimes, play a relevant role in these processes everywhere.     

Accidental Trauma Mimicking Homicidal Violence

Homicide investigations represent an important function of death investigators. Although recognizing nonobvious homicides is crucial, an equally important role involves the identification of cases that initially present as possible homicides, but are ultimately discovered to not represent homicides. Failure to recognize such cases results in wasted time, squandered resources, false allegations, and potential life‐altering consequences. The authors review a series of cases wherein initial investigation suggested a possibility that the deaths represented homicides. By carefully considering additional information, including scene findings, history, and postmortem examination, each was determined to represent an accidental traumatic death. In addition to highlighting the importance of recognizing accidental traumatic deaths that initially present as homicides, the cases serve to highlight the fact that forensic pathology cannot be practiced without knowledge of appropriate ancillary information. Although guarding against cognitive bias is important in all forensic disciplines, including forensic pathology, access to vital case‐related ancillary information is an essential component of practicing medicine as a forensic pathologist.     

新冠肺炎等传染病与法医学鉴定评述

新冠肺炎致死或引发的其他法律纠纷可能涉及法医学病理解剖或者法医临床学鉴定。在日常法医学解剖中时有遇到因传染性疾病死亡患者的尸体,法医鉴定机构及鉴定人应当有风险识别意识,充分认识到在解剖、检查这类尸体时的被传染风险。法医鉴定人需要采取充分有效的防护措施。由于新冠肺炎属于新型传染性疾病,相关研究成果、信息资料更新快,鉴定中的信息参考要慎重选择。同时本文对因传染性疾病死亡患者的尸体解剖中常见的职业伦理、知情同意、保险理赔和环境保护等问题进行讨论。     

Validation of thin layer chromatography with AccuTOF-DART™ detection for forensic drug analysis

Abstract: Thin layer chromatography (TLC) is a technique that is commonly employed in the forensic drug analysis of pharmaceutical preparations. Detection is typically accomplished using various visualization spray reagents. Conventional gas chromatography–mass spectrometry (GC‐MS) analysis is typically performed to confirm the TLC results. Depending on the drugs tested and the instrument conditions required, this confirmation can take up to an hour to complete. Direct analysis in real time (DART?) is an ionization source, coupled to an accurate‐mass time‐of‐flight mass spectrometer that has the capability to ionize materials under ambient conditions. To streamline analysis, the combination of TLC with DART? detection is proposed to screen and subsequently identify drug compounds, all from the same TLC plate. DART? confirmations of TLC analyses take <10 min to complete and compare favorably to GC‐MS in sensitivity and selectivity. This study validates the use of TLC‐DART in the forensic identification of the components of several pharmaceutical preparations.     

Context Effects in Forensic Entomology and Use of Sequential Unmasking in Casework

Context effects are pervasive in forensic science, and are being recognized by a growing number of disciplines as a threat to objectivity. Cognitive processes can be affected by extraneous context information, and many proactive scientists are therefore introducing context‐minimizing systems into their laboratories. Forensic entomologists are also subject to context effects, both in the processes they undertake (e.g., evidence collection) and decisions they make (e.g., whether an invertebrate taxon is found in a certain geographic area). We stratify the risk of bias into low, medium, and high for the decisions and processes undertaken by forensic entomologists, and propose that knowledge of the time the deceased was last seen alive is the most potentially biasing piece of information for forensic entomologists. Sequential unmasking is identified as the best system for minimizing context information, illustrated with the results of a casework trial (n = 19) using this approach in Victoria, Australia.     

胃内容物排空延缓5例分析

根据胃排空的情况进行死亡时间的推断是法医学常用方法,但有时会出现一定的误差,本文对5例胃排空显著延缓的案例进行分析,探讨提高其准确性的方法。     

脑功能磁共振成像及其法医学应用前景

脑功能磁共振成像是近年来磁共振成像技术的一项新发展。它不仅能清晰、准确地显示脑组织的解剖和病理改变,还能同时观察到脑皮层功能活动时的信息,可无创、实时地对大脑的功能活动进行成像。为法医学领域中所涉及的人体损伤程度鉴定和伤残等级评估以及对法医精神病领域中认知功能的界定,从单一形态学研究到形态与功能相结合的系统研究开辟了一条崭新的道路。本文就人脑的功能活动磁共振成像的概念、原理、优势、临床研究状况及法医学应用前景进行综述。     

Application of direct PCR in forensic casework

Direct PCR is fast becoming a popular method in forensic science due to the advantages of saving time and money in the lab while increasing the probability of obtaining substantial results has a positive rippling effect. A laboratory is able to reduce the time spent on processing trace DNA samples, which can lead to investigators receiving important information in a timely manner that may not have been possible using standard methods. This study highlights the benefits of direct PCR in forensic casework by analysing trace and touch DNA on a range of substrates and exploring the loss of initial DNA due to extraction.