Fast gas chromatography of explosive compounds using a pulsed-discharge electron capture detector

The detection of a mixture of nine explosive compounds, including nitrate esters, nitroaromatics, and a nitramine in less than 140 sec is described. The new method employs a commercially available pulsed-discharge electron capture detector (PDECD) coupled with a microbore capillary gas chromatography (GC) column in a standard GC oven to achieve on-column detection limits between 5 and 72 fg for the nine explosives studied. The PDECD has the benefit that it uses a pulsed plasma to generate the standing electron current instead of a radioactive source. The fast separation time limits on-column degradation of the thermally labile compounds and decreases the peak widths, which results in larger peak intensities and a concomitant improvement in detection limits. The combination of short analysis time and low detection limits make this method a potential candidate for screening large numbers of samples that have been prepared using techniques such as liquid-liquid extraction or solid-phase microextraction.     

The Court for Sexual Offences: perceptions of the families of the victims of sexual offences

This article aims to evaluate the degree to which the Court for Sexual Offences in Bloemfontein, Free State, South Africa and associated auxiliary institutions meet the needs of the families of the victims of sex-crimes. The perceptions of 24 family members of victims were obtained. These individuals generally perceived the functioning of the Court and its auxiliary institutions in a positive light. However, perceptions of the time that cases took to come to trial and the standard of post-trial interaction between the Court and the families was not positive. A need for more effective victim-care at both social and psychological levels was identified. Future psycho-legal research possibilities in this largely neglected field are highlighted.     

The Court for Sexual Offences: perceptions of the victims of sexual offences

This article explores the perceptions of sexual offence victims following their interaction with the Court for Sexual Offences in Bloemfontein, Free State, South Africa. The study primarily investigates these individuals' satisfaction with the degree to which the Court succeeds in providing more effective justice for victims and reduces secondary victimization during judicial proceedings. The respondents were generally positive with regard to their experiences with the Court. However, cases were still found to be slow in coming to trial. The treatment of the victims after their participation in the trials was found not to be of the same standard as that received before they testified. These findings point to potential changes to the current system to further enhance the Court's functioning and legitimacy amongst the people who make use of its services.     

Inference of human geographic origins using Alu insertion polymorphisms

The inference of an individual's geographic ancestry or origin can be critical in narrowing the field of potential suspects in a criminal investigation. Most current technologies rely on single nucleotide polymorphism (SNP) genotypes to accomplish this task. However, SNPs can introduce homoplasy into an analysis since they can be identical-by-state. We introduce the use of insertion polymorphisms based on short interspersed elements (SINEs) as a potential alternative to SNPs. SINE polymorphisms are identical-by-descent, essentially homoplasy-free, and inexpensive to genotype using a variety of approaches. Herein, we present results of a blind study using 100 Alu insertion polymorphisms to infer the geographic ancestry of 18 unknown individuals from a variety of geographic locations. Using a Structure analysis of the Alu insertion polymorphism-based genotypes, we were able to correctly infer the geographic affiliation of all 18 unknown human individuals with high levels of confidence. This technique to infer the geographic affiliation of unknown human DNA samples will be a useful tool in forensic genomics.     

Felony and misdemeanor defendants filed in the u.s. district courts during fiscal years 1990–95: An analysis of the filings of each offense level

The number of criminal defendants in cases filed in the federal courts increased by fewer than 1,000 from 1990 to 1995. Separate analyses of filings of felony and misdemeanor defendants revealed that there are different factors that influence the magnitude of the caseload of each offense level. The number of federal felony filings is strongly linked to staffing levels within the ninety-four U.S. attorneys’ offices, while the types of filings are a reflection of prosecution priorities. As a result, the magnitude of the felony caseload in the federal courts does not mirror either local or national crime rates. Misdemeanor filings, on the other hand, are dependent on enforcement practices of local authorities at military bases and/or national parks, and are concentrated within a few federal courts. The number of misdemeanor filings and traffic violations, in particular, are susceptible to dramatic changes when these local authorities modify their enforcement procedures.