Detection of Gunshot Residue on Dark‐Colored Clothing Prior to Chemical Analysis

Detection of gunshot residue (GSR) is an arduous task for investigators. It is often accomplished with chemical tests, which can reveal elements and ions indicating the presence of GSR, but are likely to cause physical alteration to the pattern. In this study, the Spex Forensics Mini‐CrimeScope MCS 400, along with 16 accompanying wavelength filters, was applied to various GSR patterns and target types. Three dark shirt materials, four ammunition calibers, and eight ammunition manufacturers, along with the primer residue of the different manufacturer ammunitions were tested. Results indicate the alternate light source wavelength of 445 nm to be the optimal setting. In addition, target material plays a large role in the preservation of GSR patterns as particles burn. Furthermore, it can be extrapolated that residue, observed from a full round and firing distance of six inches, is mostly composed of unburnt gunpowder residue, not primer residue.     

Book reviews

John R. Davis, Britain and the German Zollverein, 1848–66 (London: Macmillan, 1997). x + 238 pp. £45. ISBN 0–333–67828–1.

Martin Thomas, Britain, France and Appeasement: Anglo‐French Relations in the Popular Front Era (Oxford and New York: Berg. 1996). xi + 268 pp. £29.95 hb; £12.95 pb. ISBN 1–85973–192–9.

Peter Lowe, Containing the Cold War in East Asia: British Policies Towards Japan, China and Korea, 1948–53 (Manchester: Manchester University Press, 1997). xii + 288 pp. £40. ISBN 0–7190–2508–7.

David M. Barrett, Uncertain Warriors: Lyndon Johnson and His Vietnam Advisers (Lawrence, Kansas: University of Kansas Press, 1994). xii + 279 pp. £11.95 pb. ISBN 0–7006–0631–9.

Rhodri Jeffreys‐Jones, Changing Differences: Women and the Shaping of American Foreign Policy, 1917–1994 (New Brunswick, NJ: Rutgers University Press, 1997). x + 275 pp. £14.50 pb. ISBN 0–8135–2449–0.

Philip M. Taylor, Global Communications, International Affairs and the Media Since 1945 (London &; New York: Routledge, 1997). xx + 248 pp. £45 hb. ISBN 0–415–11678–3; £15.99 pb. ISBN 0–415–11679–1     

A dedicated automated system for extraction, quantification and STR amplification of forensic evidence samples

Forensic DNA analysis is a multi-step process involving extraction of DNA, quantification of human DNA in the extract, amplification using multiplex STR systems, separation of products, and data analysis. The backlog of forensic casework is increasing worldwide. Automation is one significant way to alleviate the bottleneck of sample processing in forensic labs. The HID EVOlution™ Combination System described here is a robust, reliable sample processing platform, easily adapted to forensic laboratory workflows. Using a variety of forensic sample types including: blood stained FTA paper, cotton fabric and denim, dried blood spiked with known PCR inhibitors, saliva on cotton swabs, and semen stains, we found that yields of human DNA and STR profiles obtained with AmpFlSTR^® Idenitfiler^® kits were complete, highly reproducible, and equivalent to results obtained using the manual PrepFiler™ reagent extraction method. Automated operation was clean, and no cross-contamination was detected between extraction blanks and interspersed high DNA content samples.     

A Perspective on Errors,Bias, and Interpretation in the Forensic Sciences and Direction for Continuing Advancement*

Abstract: The forensic sciences are under review more so than ever before. Such review is necessary and healthy and should be a continuous process. It identifies areas for improvement in quality practices and services. The issues surrounding error, i.e., measurement error, human error, contextual bias, and confirmatory bias, and interpretation are discussed. Infrastructure is already in place to support reliability. However, more definition and clarity of terms and interpretation would facilitate communication and understanding. Material improvement across the disciplines should be sought through national programs in education and training, focused on science, the scientific method, statistics, and ethics. To provide direction for advancing the forensic sciences a list of recommendations ranging from further documentation to new research and validation to education and to accreditation is provided for consideration. The list is a starting point for discussion that could foster further thought and input in developing an overarching strategic plan for enhancing the forensic sciences.     

The Sanctions-Perceptions Link in a Model of School-based Deterrence

This paper reports a study examining associations between objective indicators of the level of discipline within schools and students’ perceptions of the strictness of discipline. Data were analyzed from the National Education Longitudinal Survey (NELS), a nationally representative panel study of eighth grade students attending public and private schools in 1988. We find evidence for an association between objective and perceived risk of discipline in models that examine the covariation of these two constructs at several cross sections, and in models of change in perceptions as a function of change in school sanctioning climate. Moreover, these associations were strongest in small and less disordered schools.

Preventing suicide in prisons, part I. Recommendations from the International Association for Suicide Prevention Task Force on Suicide in Prisons

In 2000 the Department of Mental Health of the World Health Organization (WHO) published a guide named Preventing Suicide. A Resource for Prison Officers as part of the WHO worldwide initiative for the prevention of suicide. In 2007 there are new epidemiological data on prison suicide, a more detailed discussion of risk factors accounting for the generally higher rate of suicide in correctional settings in comparison to the general population, and several strategies for developing screening instruments. As a first step, this paper presents an update of the WHO guide by the Task Force on Suicide in Prisons, created by the International Association for Suicide Prevention. A second paper, by the same Task Force, will present some international comparisons of suicide prevention services in correctional facilities.     

Exchange Rate Pass-through to Import Prices,and Monetary Policy in South Africa

Abstract

Understanding how import prices adjust to exchange rates helps anticipate inflation effects and monetary policy responses. This article examines exchange rate pass-through to the monthly import price index in South Africa during 1980–2009. Short-horizon pass-through estimates are calculated using both single equation equilibrium correction models and systems (Johansen) models, controlling for both domestic and foreign costs. Average pass-through is incomplete at about 50 per cent within a year and 30 per cent in six months, and in the long-run, from the Johansen analysis including feedback effects, is about 55 per cent. There is evidence of slower pass-through under inflation targeting; pass-through is found to decline with recent exchange rate volatility and there is evidence for asymmetry, with greater pass-through occurring for small appreciations.