The Spatial Distribution of Postblast RDX Residue: Forensic Implications

Locating exactly where trace explosive residue samples should be sought during sample collection at bomb scenes is not specified in the published literature or guidelines; in this area, it is generally acknowledged that forensic practices are based on tradition rather than evidence. This study investigated patterns in the spatial distribution of postblast 1,3,5‐trinitro‐1,3,5‐triazocyclohexane residue from a series of unconfined detonations, over a range of sampling sites, and at two different detonation heights. The amount of residue recovered from the sites decreased as a function of distance from the center of the explosion. [Correction added after online publication 27 December 2012: In the preceding sentence, “increased” was corrected to “decreased” to agree with the conclusion of the article.] As the height of the detonations increased, more residues were found from all sampling sites. The findings of this empirical study have a number of important practical implications including determining where residue samples are best sought at crime scenes.     

A New Method for the Removal and Analysis of Small Particles Adhering to Carpet Fiber Surfaces,,

Fibers are a commonly encountered evidence type and fiber comparisons are routinely conducted. When the characteristics of questioned and known fibers correspond, the probative value is limited because the characteristics compared are determined by their manufacture. It would be valuable to test the hypothesis that questioned fibers originated from a specific carpet. One means of testing this is to analyze fine particles on the fibers. A procedure was developed for removing adhering particles from fibers and preparing them for scanning electron microscopy/ energy dispersive X‐ray spectrometry (SEM/EDS) analysis. The efficacy of several fluids (acetone, ethanol, hexanes, aqueous ethanol, aqueous sodium hexametaphosphate) and agitation methods (sonication and vortexing) for removing particles from fibers was evaluated. The most effective method evaluated was sonication in ethanol for 10 min. The recovered particles were filtered onto a polycarbonate filter and analyzed by automated SEM/EDS analysis to generate data on the particle assemblage. This method makes possible future research to test the within‐item and between‐item variability of particle assemblages on fibers.     

Ultrafast Amplification of DNA on Plastic Microdevices for Forensic Short Tandem Repeat Analysis

The majority of microfluidic devices used as a platform for low‐cost, rapid DNA analysis are glass devices; however, microchip fabrication in glass is costly and laborious, enhancing the interest in polymeric substrates, such as poly (methyl methacrylate) (PMMA), as an inexpensive alternative. Here, we report amplification in PMMA polymerase chain reaction (PCR) microchips providing full short tandem repeat profiles (16 of 16 loci) in 30–40 min, with peak height ratios and stutter percentages that meet literature threshold requirements. In addition, partial profiles (15 of 16 loci) were generated using an ultrafast PCR method in 17.1 min, representing a ~10‐fold reduction in reaction time as compared to current amplification methods. Finally, a multichamber device was demonstrated to simultaneously amplify one positive, one negative, and five individual samples in 39 min. Although there were instances of loci dropout, this device represents a first step toward a microfluidic system capable of amplifying more than one sample simultaneously.     

Optimizing Accu Time‐of‐Flight/Direct Analysis in Real Time for Explosive Residue Analysis

The use of a direct analysis in real time (DART) mass spectrometer (MS) instrument was optimized for 22 compounds of organic explosive residues to provide a guide for DART‐MS users in rapid screening of explosive compounds. Samples were introduced as neat solutions and sequential dilutions to determine optimal instrument conditions and lowest concentration detectable. Most compounds were optimized to 250°C in the negative ion mode, and several compounds benefited from the addition of a chloride dopant from methylene chloride (amino‐dinitrotoluenes, RDX, EGDN, and PETN). Few compounds were more sensitive in the positive ion mode (TEGDN, DEGDN, HNS, and DMNB). Mixtures of compounds were detected using clean room wipes, directly from their surfaces and from subsequent extractions. Compounds from the mixtures were also successfully detected in soil and from swipes of spiked surfaces. The instrument showed merit in detection of pg/μL solutions for most of the compounds and among the substrates tested.     

Analyzing Forensic Evidence Based on Density with Magnetic Levitation

This paper describes a method for determining the density of contact trace objects with magnetic levitation (MagLev). MagLev measurements accurately determine the density (±0.0002 g/cm³) of a diamagnetic object and are compatible with objects that are nonuniform in shape and size. The MagLev device (composed of two permanent magnets with like poles facing) and the method described provide a means of accurately determining the density of trace objects. This method is inexpensive, rapid, and verifiable and provides numerical values—independent of the specific apparatus or analyst—that correspond to the absolute density of the sample that may be entered into a searchable database. We discuss the feasibility of MagLev as a possible means of characterizing forensic‐related evidence and demonstrate the ability of MagLev to (i) determine the density of samples of glitter and gunpowder, (ii) separate glitter particles of different densities, and (iii) determine the density of a glitter sample that was removed from a complex sample matrix.     

Product counterfeiting and the media: examining news sources used in the construction of product counterfeiting as a social problem

Product counterfeiting has received increased attention due to its economic and public health impact. Media framing of product counterfeiting shapes how the public and policymakers understand the problem. While there is a large body of literature examining crime and the media generally, empirical studies have yet to focus on the media construction of product counterfeiting. This study presents the results of a content analysis using a random sample of newspaper articles referencing product counterfeiting in the New York Times and the Wall Street Journal from 2000 to 2009. Articles were coded for common patterns in sources of information. While the results indicate the presence of a wide variety of themes, product types, and industries, government and business sources are overrepresented among the sources cited, leading to some level of consistency in the presentation of the impact of and appropriate responses to product counterfeiting. Implications for understanding how the public and policymakers understand product counterfeiting are discussed.     

实案测试中被测试对象心理状态探析

心理学的研究离不开各种实验,心理测试技术(俗称"测谎"技术)实际上就是心理学实验方法的一种。此项技术在我国的研究应用已经30多年,辅助司法领域进行了大量的实案心理测试①。不仅对陷入侦破困境的案件起到很大作用,也对心理学在实战领域的应用研究提供了一种实验范式。对进行心理测试案件的研究发现,很多的变量都会影响到测试的结果,进而影响测试效度。被测人②的心理状态是其中很重要但是很容易被忽视的因素之一,这是一个非常值得关注研究的领域,不仅关系到心理测试技术的发展,也关系到司法领域人权和司法公正问题。     

Mapping Urban Revitalization: Using GIS Spatial Analysis to Evaluate a New Housing Policy

This longitudinal, multimethod study uses geographical information system (GIS) software to evaluate the community-wide impact of a neighborhood revitalization project. Unsystematic visual examination and analysis of GIS maps are offered as a complementary tool to quantitative analysis and one that is much more compelling, meaningful, and effective in presentation to community and nonscientific professional audiences. The centerpiece of the intervention was the development of a new, middle-class housing subdivision in an area that was declining physically and economically. This represents three major urban/housing policy directions: (1) the emphasis on home ownership for working-class families, (2) the deconcentration of poverty through development of mixed-income neighborhoods, and (3) the clean up and redevelopment of contaminated, former industrial brownfields. Resident survey responses, objective environmental assessment observations, and building permit data were collected, geocoded at the address level, and aggregated to the block level on 60 street blocks in the older neighborhoods surrounding the new housing in two waves: during site clearing and housing construction (Time 1: 1993–95) and three years post-completion (Time 2: 1998–99). Variables mapped include (a) Time 1–2 change in self-reported home repairs and improvements, (b) change in the assessed physical condition of yards and exteriors of 925 individual residential properties, (c) change in residents' home pride, and (d) a city archive of building permits at Time 2. Physical conditions improved overall in the neighborhood, but spatial analysis of the maps suggest that the spillover effects, if any, of the new housing were geographically limited and included unintended negative psychological consequences. Results argue for greater use of GIS and the street block level in community research and of psychological and behavioral variables in planning research and decisions.     

Community Service Providers' Conceptualizations of the Needs and Services of Depressed Rural Women

Abstract

Representatives from community and volunteer organizations (N = 37) in a rural region of Nova Scotia were interviewed on their views of the causes, prevention and treatment of depression in rural women. Utilizing a qualitative analysis, five themes were identified in their responses: the needs and stresses of women with depression; the problems of women in rural areas; obstacles and barriers to accessing services; the inadequacy of treatment services; and recommendations for improving prevention and treatment. The findings suggested that community service providers were consistent in their views of the needs and stresses of depressed women in rural areas and the kinds of services that would remedy them. Making community service providers aware of the consistencies in their views may promote more interagency cooperation and the development of community-centered approaches to the treatment of depression in rural women.     

证据制度的调整对我国侦查制度的影响——以新《刑事诉讼法》为视阈

新《刑事诉讼法》对证据制度进行了较大幅度的修改。证据裁判理念正深入人心．侦查人员应强化证据意识、更新侦查理念。非法证据排除规则已经确立,取证行为规范化将成为关注的焦点。证据的概念、种类和范围的调整,行政证据的合法化,以及立法对过去侦查实践的肯定,使得侦查办案模式惯性发展不可避免：明文规定侦查人员有出庭作证的义务,对侦查人员的素质提出了新挑战;不自证其罪和如实供述的矛盾并存,侦查机关需要尊重和顺应法律价值变化的潮流。切实保障人权。