Comparative Analysis of the Chemical Profiles of 3,4-Methylenedioxymethamphetamine Based on Comprehensive Two-Dimensional Gas Chromatography-Time-of-Flight Mass Spectrometry (GC × GC-TOFMS)*

Abstract: The chemical profiling of illicit drugs is an important analytical tool to support the work of investigating and law enforcement authorities. In our work, comprehensive two‐dimensional gas chromatography–time‐of‐flight mass spectrometry (GC × GC‐TOFMS) combined with nontargeted, pixel‐based data analysis was adapted for the chemical profiling of 3,4‐methylenedioxymethamphetamine (MDMA). The validity and benefit of this approach was evaluated by analyzing a well‐investigated set of MDMA samples. Samples were prepared according to a harmonized extraction protocol to ensure the comparability of the chemical signatures. The nontargeted approach comprises preprocessing followed by analysis of variances as a fast filter algorithm for selection of a variable subset followed by partial least squares discriminant analysis for reduction to promising marker compounds for discrimination of the samples according to their chemical profile. Forty‐seven potential marker compounds were determined, covering most of the target impurities known from the harmonized one‐dimensional profiling as well as other compounds not previously elucidated.     

Watch for those fragments of evidence: the use of an automatic timepiece to help correlate a helicopter crash site from the Vietnam War

This case study illustrates the use of the date function on an automatic wristwatch to help identify a Vietnam War helicopter crash site. The location of a crash incident can sometimes be uncertain because of inadequate or inaccurate wartime records and the passage of time. Artifacts recovered from a prospective crash scene are regularly used to correlate the loss incident. In this case study, a recovered automatic watch displayed a date 2 days later than the reported loss incident. Although the date conflicts with the aircraft crash incident report, it is observed that a fully wound automatic watch continues to work for c. 2 days after movement of the watch ceases. Thus, the watch's date in fact correlates with the aircraft crash incident report. It is noted that automatic watches may also be used to date scenes of crime.     

Decaying Mouse Volatiles Perceived by Calliphora vicina Rob.‐Desv.

Volatiles emitted by decaying human remains are in the focus of recent research. The identification of core volatiles in this field is of high importance, because cadaveric volatiles generally show high variation. In this study, the volatile profiles of five mice (Myodes glareolus) were sampled with charcoal filter tubes from their time of death until advanced decay. Eleven compounds were quantitated by means of gas chromatography–mass spectrometry. Electroantennographic experiments with female Calliphora vicina antennae led to the identification of dimethyl trisulfide, dimethyl disulfide, nonanal, hexan‐1‐ol, 1‐octen‐3‐ol, 3‐methylbutan‐1‐ol, and heptanal as electrophysiologically active compounds. When these were compared, dimethyl trisulfide (17 ng/μL) and dimethyl disulfide (11 ng/μL) were found to be emitted in higher concentrations. The roles of these compounds and nonanal as core volatiles for cadaver detection or postmortem time determination and their correlation to the stages of decay and the accumulated degree days are discussed.     

Family Group Conferencing and Re‐Offending Among First‐Time Juvenile Offenders: The Indianapolis Experiment

Restorative justice processes, and family group conferences in particular, have become increasingly common in justice system practices across the globe. There has also been significant scholarly interest. Yet, with several notable exceptions, much of the research has been characterized by relatively weak designs, and questions related to the impact of family group conferences on re‐offending remain unanswered. This research is intended to begin to address these issues. The study is based on an experiment conducted in Indianapolis, Indiana whereby young, first‐time‐offending youths were randomly assigned to either a family group conference or one of a number of court‐ordered diversion programs. Nearly 800 youths participated in the experiment, and the cases were tracked for 24 months following their initial arrest. Survival analysis techniques were used to compare prevalence patterns of re‐offending among the treatment and control groups. The results indicated a significant difference between the two groups with the control group experiencing higher rates of failure (re‐offending). The differences were most pronounced during the period of 3–8 months following the initial arrest. Incidence rates were also compared. Assignment to the treatment group was negatively related to incidence of offending. Given the consistent finding of victim benefits in restorative justice processes, the results suggest that conferences hold promise as an effective intervention, at least for young first‐time offenders, and warrant continued experimentation.     

试析三岩社会的农牧二元经济

为克服土地资源的不足,三岩峡谷历史地形成了农业与牧业两种生产方式并存的经济结构。农牧并举的二元经济结构也在很大程度上影响了三岩峡谷内部的社会及文化。与土地相关的一系列技术与文化成为当地的文化核心,而其他的文化要素都根源于三岩人使用土地的技术。由此导致三岩的二元结构并没有与社会的阶序化相结合,也没有形成人群之外的二元划分,而是始终依附于特定生态与自然环境以及与此相适应的血缘群体。     

Survey Research in International Political Economy: Motivations,Designs, Methods

The use of surveys and survey experiments by international political economy scholars is increasing, adding to the ability to study a broad array of topics. In doing so, many scholars in international political economy draw on—and are contributing to—insights and arguments from American politics and comparative politics (Milner 1998), substantive fields with a history of using surveys and survey experiments. In this article, I review motivations for using surveys and survey experiments, the research designs, and analysis strategies in light of this issue’s contributions. I contrast these motivations and their accompanying designs and discuss the pros and cons of ways to approach the data generated by these research designs. The goal of this commentary is to situate surveys and survey experiments—especially those within the special issue—within a larger discussion about research motivations, design, and analysis techniques.     

河北省未成年人犯罪基本情况调查及原因分析

采用艾森克个性问卷及自编基本情况调查表对395名未成年男犯进行调查,结果显示,未成年男犯在文化程度、作案地区、家庭结构及家庭教养方式等方面存在新的变化趋势,犯罪原因集中在家庭、学校、社会及个人心理因素等各方面。     

Talking about radicalization

ABSTRACT

This article seeks to build a bridge between the criminological tradition of research on hard-to-reach groups and sensitive topics and the tradition of critical research on radicalization. As a result of the hard-to-reach character of so-called radicals themselves, the article analyzes interview experiences with ‘professionals’ working within the prevention of radicalization and other actors. This article discusses the experiences connected to the preparation and unfolding of the interviews on the sensitive topic of radicalization and illustrates how interviews and questions designed to gather knowledge about radicalization processes among Muslims in Denmark often became a discussion about the concept of radicalization itself. This article shows that making use of the concept of radicalization is problematic in interviews as it is embedded in the Danish political discourse on immigration, Muslims and Islam. This article reflects on researcher positionality and how being a white ethnic Danish researcher might have caused an underestimation of how problematic the concept is to people directly involved with it, and that speaking from such a researcher positionality also can make the concept of radicalization seem even more problematic.     

Development of an instrument for assessing the quality of forensic evidence and expert testimony from three feature-comparison methods: DNA,voice, and fingerprint analysis

In a context of rising violence and long-lasting impunity, in 2008, Mexico's criminal justice system underwent a radical change from an inquisitorial model to an adversarial one, to make it more effective, transparent, and expeditious. The new system tasked judges with publicly determining the admissibility of forensic evidence, as well as assessing its technical quality and probative value—tasks for which they currently receive little to no training. With the aim of contributing to the consolidation of the adversarial model, a comparative framework—in the form of a checklist—of the analysis of fingerprints, DNA samples, and voice recordings was created. To do so, a review of the academic literature, published reports, and guidelines was performed. The collected data were synthesized and submitted to a panel of Mexican judges, who provided feedback on its adequacy. The framework focuses on the steps on which quality assurance of forensic evidence depends, organized in five discrete stages that span from the collection of samples at the scene of a crime to the presentation of evidence at trial, specifying the main technical criteria experts should state to allow a decision maker to examine its accuracy and reliability. Differences and commonalities among the three methods were identified, particularly in terms of how qualitative and quantitative analyses are performed in each. Besides its potential usefulness as an aid for judicial decision-making, the checklist could be a valuable resource for training programs aimed at judges, as well as quality assurance programs.