A Comparison of Four Presumptive Tests for the Detection of Blood on Dark Materials

Detection of blood on dark materials is difficult for crime scene examiners so presumptive tests are used to assist. This study compared the ability of luminol, leuko crystal violet, tetramethylbenzidine, and Combur Test®E to detect whole, diluted blood (1:100) and a key‐shaped blood transfer stain (1:10), on dark cotton sheeting, tea towel, socks, synthetic carpet, and car mats. Powdered bleach was used to evaluate specificity of the blood detection tests. Sensitivity, specificity, positive predictive value (PPV), negative predictive value (NPV), and overall misclassification rate (OMR) assessed the quality of the blood tests. Luminol was the preferred test for diluted blood having the highest sensitivity (79%–96%), NPV (66%–93%), and the lowest OMR (3%–15%). Luminol was also found to be most efficient with a testing time on 25 items of 2 h 50 min compared with up to 8 h. Overall, luminol was the most effective method, also providing information on bloodstain patterns.     

Explosion Scene Forensic Image Interpretation

Image interpretation is an important aspect in the field of forensic science; however, it is seldom reported how to use these techniques in explosion scene forensic investigations. On 12 August 2015, a series of explosions killed 165 people and injured hundreds more at a container storage station at the Port of Tianjin. In this study, we applied image interpretation methods to determine the seat of the explosion by analyzing low‐quality video clips of the event. The interpretation fits well with recently published standard operating procedures, including the hypothesis, evaluation, inference, and confirmation. Image processing was adopted to enhance the images while the explosion scene was reconstructed with the same images. Some important features were extracted and utilized to distinguish whether the flashes were caused by reflection or a real blast. We reveal the real explosion location, which guides the overall investigation. The results indicate that image interpretation is a powerful tool for forensic investigators to analyze low‐quality images in complicated explosions or fire accidents.     

Sympathy for the devil: state engagement with criminal organisations in furtherance of public policy

Governments have long relied on non-state actors to assist in the implementation of public policy. Legitimate elements of civil society have become familiar instruments of governance. States have also engaged criminal actors to this end. This article will note examples of state collaboration with criminal interests, from pirates turned privateers during the 17th and 18th centuries, to the patriotic hackers of today. It will discuss the strategic considerations giving rise to such engagements, the pitfalls that may beset them, and the ethical considerations that might inform the decision by a state to enlist the services of illicit organisations.     

Marriage,Cohabitation, and Crime: Differentiating Associations by Partnership Stage

A wealth of scholarship generally finds that marriage protects against crime, but there is less consistent evidence for cohabitation. In this article, we contribute to scholarship on marriage and put forward new evidence about cohabitation by examining marital and cohabiting partnerships as transitions with distinct stages of entry, stability, and dissolution. We use within-person change models with contemporary data from the National Longitudinal Survey of Youth 1997 to analyze these stages for the full sample and separately for men and women. The findings show differential protective associations of marriage and cohabitation depending on the stage of the partnership. Both recently formed cohabiting partnerships and stable cohabiting partnerships are associated with reductions in the level of offending, although to a lesser degree than marital relationships. Cohabiting partnerships that are stable, in that they have lasted at least a year, are associated with larger decreases in offending, particularly among women.     

中国古代判词与当代刑事判决书对比研究

中国古代判词作为古代司法官员听讼断狱所制作的司法文书,反映着中国历史上的礼法文化传统。当下中国的刑事判决书改革,不仅需要借鉴国外的先进庭审制度和制判模式,而且需要从我国的本土断案决狱文化中汲取营养,把我国优秀的传统法律文化发扬光大,从而更好地推动司法改革的发展。本文首先对中国古代判词进行分类,继而从古代判词的文学性特征、道德化倾向、天理、人情和法意的兼顾、文本结构和用词的感情色彩等角度探讨了古代判词与现代刑事判决书的差异,并揭示了其对当今刑事判决书改革的启示。古代判词的这些特征不仅有利于实现古代社会的司法目的,对于中国当下的司法改革,尤其是刑事判决书改革也具有现实的参考价值。     

Referrals to a mental health criminal justice Liaison and diversion team in the North East of England

There is growing interest in the health correlates of people detained in police custody, and a number of innovations have been introduced to try to meet the complex needs of detainees. The implementation of Criminal Justice Liaison and Diversion (CJL&D) Services commissioned by the Department of Health in England is a substantial part of this investment. In this paper, we describe data from 858 detainees who were referred to the CJL&D service of a busy metropolitan police station in the North East of England. The detainees referred to the service had complex mental health needs, substance misuse and a range of vulnerabilities requiring specific intervention. The effective operation of these teams and how they interface with health and criminal justice systems also depend upon a number of systematic issues that emanate both from within the teams, and from external policy drivers.     

The importance of dark adaptation for forensic examinations; an evaluation of the Crime-lite Eye™

Forensic practitioners are recommended to dark adapt their eyes prior to conducting evidential searches in the dark. The dark adaptation process remains poorly standardised across the discipline, with little quantified regarding the benefits of such preparative steps. Herein, we report the findings of a study that recruited 50 participants to assess the effectiveness of the Crime-lite Eye?, a darkness adaptation device developed to assist forensic practitioners both in the laboratory and in field. Participants were tasked with searching for the fluorescent signatures left by reaction of 1,8-diazafluoren-9-one (DFO) with amino acids, in a manner akin to the fluorogenic fingerprint treatment of porous evidence. Using an Epson Stylus Photo R265 inkjet printer, ink cartridges were filled with alanine solutions of various concentrations, allowing different motifs to be printed onto copy paper and subsequently developed using DFO. Participants searched for this ‘evidence’ both with and without dark adapted vision. On average, participants were able to locate and correctly recognise 16% more evidence once dark adapted using the Crime-lite Eye?.The increase in evidence located by participants once dark adapted suggests that crime scene officers should be dark adapting in order to visualise as much as possible. The time taken to dark adapt, 10?min on average during this study, is not excessively long, and should not significantly slow the investigation.     

Can analysis of a small clod of soil help to solve a murder case?

Soil forensics utilizes extensive soil information to answer legal questions and test hypotheses. The main difficulty often is the determination of different variables from a small amount of soil sample collected on the suspect. We developed a sequential mineralogical and chemical analyses to assess a limited quantity of soil vestiges (0.5 g) from a suspect's vehicle (adhered to the outside rear-view mirror and to the left front fender) involved in a murder case and compared them with the surface samples found at the victim's body disposal site at the Graciosa Road, Paraná State, Brazil. All results affirm that the suspect’s vehicle could have been in contact with the edge of the Graciosa Road, approximately the place where the victim’s body was located. As a result of the soil analysis and comparison, the results support the likely contact of the suspect’s vehicle with the crime scene.     

我国刑事被告人品格证据规则之探索

近年来,我国在刑事司法领域开展一系列制度性改革,其中"和谐司法"、"认罪认罚从宽"、"恢复性司法"等缓和性司法理念与制度正在全面铺开。某些缓和性刑事政策需要被追诉方的品格加以佐证支撑,以对其人身危险性进行度量。因此了解和审查被追诉方品格因素就显得很关键。品格证据可以对被告人刑事责任承担产生较大影响。故研究品格证据,可在理论上界定品格证据含义特征,探究域外规则发展路径,归纳我国建立该规则的可行建议,完善我国证据规则体系。