The detection of beta-cypermethrin during forensic chemical expertise of biological materials

The optimal conditions for the isolation of beta-cypermethrin from biological materials by means of dioxane extraction have been developed. The possibility to purify beta-cypermethrin from endogenous impurities is demonstrated by combination of liquid-liquid extraction and chromatography through a silica gel column (L 40/100 mcm). It is shown that identification and quantitative determination of beta-cypermethrin extracted from the cadaveric liver tissues are possible using such techniques as thin-layer chromatography, electron spectrometry, and chromato-mass spectrometry. A method for forensic chemical expertise of the presence of beta-cypermethrin in biological materials is described.     

法医病理检案工作中的人为现象

目的 研究法医病理检案工作中常见的人为现象及其造成法医学鉴定结论错误的原因。方法 收集13例法医病理复核鉴定案例,并对其进行回顾性分析。结果 胸外心脏按压所致肋骨骨折,胸、腹腔出血及肺动脉栓塞栓子破碎,误认为生前外伤或死因不明5例;胰腺死后变化(自溶和被膜下及间质出血),误认为急性出血坏死性胰腺炎4例;死后动物咬伤误认为生前损伤2例;腐败尸斑误认为皮下出血1例;死后颈部解剖不当造成颈部肌肉出血,影响死因分析1例。结论 法医病理检案工作中的人为现象,常导致法医学鉴定的结论错误。     

Evaluating expertise in forensic anthropology

The medicolegal system relies on the ability of experts and non-experts alike to make judgments about expertise and use those judgments to reach consequential decisions. Given the lack of standard criteria, mandatory certification, or licensure for establishing expertise required to practice forensic anthropology and testify as an expert witness, we sought to understand how individuals assess and identify expertise in forensic anthropology by using a social science tool called the Imitation Game. This tool assesses immersion in a specific area of study via discourse, with the premise that some individuals lacking expertise themselves imitate or attempt to pass as experts. For this project we recruited volunteers with varying expertise in forensic anthropology to participate in interviews which asked questions about the practice and structure of the discipline. Those interviews were transcribed, anonymized, and evaluated by other recruited individuals with varying expertise in forensic anthropology. Results found that judges who were experts in forensic anthropology performed better than non-expert judges in determining who was not an expert in forensic anthropology based on their anonymized responses; however, nearly half of the non-experts were still able to pass as experts in forensic anthropology. The difficulties in assessing expertise based on discourse interactions demonstrates the value and need for well-defined credentials and mandatory certification to practice forensic anthropology. This study demonstrates that accurately identifying expertise in forensic anthropology may be challenging for both experts and non-experts, especially when relying solely on interactional expertise rather than formal assessments of competency which directly elucidate contributory expertise.     

Visual attention and expertise for forensic signature analysis

Eye tracking was used to measure visual attention of nine forensic document examiners (FDEs) and 12 control subjects on a blind signature comparison trial. Subjects evaluated 32 questioned signatures (16 genuine, eight disguised, and eight forged) which were compared, on screen, with four known signatures of the specimen provider while their eye movements, response times, and opinions were recorded. FDEs' opinions were significantly more accurate than controls, providing further evidence of FDE expertise. Both control and FDE subjects looked at signature features in a very similar way and the difference in the accuracy of their opinions can be accounted for by different cognitive processing of the visual information that they extract from the images. In a separate experiment the FDEs re-examined a reordered set of the same 32 questioned signatures. In this phase each signature was presented for only 100 msec to test if eye movements are relevant in forming opinions; performance significantly dropped, but not to chance levels indicating that the examination process comprises a combination of both global and local feature extraction strategies.     

关于基层法医病理检验的思考

随着社会发展和公民法律意识的提高。要求尸体检验的人数逐年增加，同时，社会对公安机关尸体检验中各个方面的要求也在逐渐提高，但在我国特别是欠发达的基层公安机关，法医病理检验仍存在很多问题，笔者就几个主要问题展开讨论。     

Using electrophoresis for the identification of subjects in forensic medical expertise

It was proven as advisable to apply the electrophoretic method in sophisticated expertise cases for the purpose of defining the nature of objects in examinations of material evidence.     

关于基层法医病理检验的思考

随着社会发展和公民法律意识的提高,要求尸体检验的人数逐年增加,同时,社会对公安机关尸体检验中各个方面的要求也在逐渐提高,但在我国特别是欠发达的基层公安机关,法医病理检验仍存在很多问题,笔者就几个主要问题展开讨论。一、基层法医病理检验存在问题问题1,没有理解法医病理中法与医的关系,只强调医的内容,忽略“为法服务”是“医”的目的。基层的法医工作者大部分从中专卫校毕业或其他与医疗有关的单位调入,如军队卫生队。没有严格法医专业教育培训,且大部分至今从未参加过一次法医专业知识的培训,几乎均以“师承”的方式学习法医,所以…     

医疗纠纷的法医学鉴定

目的研究医疗纠纷法医学鉴定的特点,并讨论医疗纠纷法医学鉴定的重点及难点。方法将医疗缺陷分为责任性缺陷、技术性缺陷、管理性缺陷、学科性缺陷和其他缺陷,对36件案例分别进行分类并进行统计。其中把18例由医疗事故鉴定委员会鉴定的结论与我室的鉴定结果进行比较分析,其他18例另行统计。结果36例案件中存在医疗缺陷的占86.11%,其中技术性缺陷66.67%,责任性缺陷和管理性缺陷均占25%。18例由医疗事故鉴定委员会鉴定的结论与我室的鉴定结果进行比较,医疗缺陷的认定两者有明显差异(P<0.05),对于医疗缺陷已对患者造成不良影响的认定,两者具有显著性差异(P<0.01)。结论法医进行医疗纠纷的鉴定,对医疗纠纷诉讼案件的处理起着积极的作用。目前,医疗纠纷的法医学鉴定仍存在许多问题需要进一步讨论。     

Efficiency of hardware-assisted tools in forensic expertise

The authors analyze the efficiency of special-purpose hardware-assisted tools (SHT) in forensic expertise. Unlike clinical medicine, in which the methods of quantitative and qualitative analysis are comprehensively used in choosing drugs, issues related with providing the state forensic-expertise facilities with specialized equipment have not been virtually elaborated up to now. The qualitative analysis based on the subjective evaluation of experts is used presently for the purposes. Therefore, development of objective criteria of evaluation of SHT for forensic expertise is an important and topical issue.     

Detection of azaleptine in forensic chemical examination of cadaveric material

Azaleptine detection and quantitation in cadaveric material in forensic-chemical tests using thin-layer chromatography, UV-spectrophotometry, gas chromatography-mass spectrometry are outlined.     

Diatoms in forensic expertise of drowning--a Macedonian experience

Results obtained by examination of 22 human cases suspected for drowning, one human case of death other than drowning and several tests on laboratory rats were used as a basis for evaluation of diatom method as supportive in forensic expertise of drowning. The recovery of diatoms from various examined organs, their qualitative and quantitative composition, if properly treated without the possibility of contamination, can be a reliable proof of the time and place of drowning. The priority of organ examination (external microflora determination, lungs, brain, heart (and/or blood), stomach, liver and kidney, and finally bone marrow) is discussed and established as well as the basic future research on cases suspected of drowning, but also on non-drowned victims and laboratory animals.