A Statistical Validation of the Individuality and Repeatability of Striated Tool Marks: Screwdrivers and Tongue and Groove Pliers*

Abstract: Tool mark identification relies on the premise that microscopic imperfections on a tool’s working surface are sufficiently unique and faithfully transferred to enable a one‐to‐one association between a tool and the tool marks it creates. This paper presents a study undertaken to assess the validity of this premise. As part of this study sets of striated tool marks were created under different conditions and on different media. The topography of these tool marks was acquired and the degree of similarity between them was quantified using well‐defined metrics. An analysis of the resulting matching and nonmatching similarity distributions shows nearly error‐free identification under most conditions. These results provide substantial support for the validity of the premise of tool mark identification. Because the approach taken in this study relies on a quantifiable similarity metric, the results have greater repeatability and objectivity than those obtained using less precise measures of similarity.     

Quick Screening of Crystal Methamphetamine/Methyl Sulfone Exhibits by Raman Spectroscopy

Abstract: The analysis of mixtures of “crystal meth” (usually comprised of methyl sulfone [MS] and methamphetamine [MA]) by gas chromatography‐mass spectrometry (GCMS) is routine in many forensic drug laboratories. The utilization of Raman spectroscopy for the identification of such mixtures quickly and without the need for a separation technique is discussed. Samples were dissolved in water and Raman spectra of the resulting aqueous solutions were collected. By comparing these spectra to spectra of methylsulfone and MA mixtures of known composition, an indication of the composition of the sample can be obtained in only a few minutes. This spectral comparison also can be used as a semi‐quantitative analysis of MA concentrations in such exhibits.     

Criminal career progression among serious youthful offenders in Australia

An important question from research on criminal careers is whether the processes that generate participation in criminal activity are similar to those that drive offending frequency among those who have initiated. This article considers basic demographic correlates asking whether those factors are associated with both initial and sustained early adulthood criminality in Australia. Three findings emerged from the study: (1) the offenders exhibited high levels of criminal activity during early adulthood; (2) males were more likely than females to offend and offend at higher rates as adults; and (3) Indigenous youth were more likely than non-Indigenous youth to offend and offend at higher rates as adults. Overall, the study results showed that basic correlates of crime were linked to both participation and frequency of offending in early adulthood—even within a sample of serious offenders. The article addresses the theoretical implications of the findings and directions for future research.     

Informal Controls and the Explanation of Propensity to Offend: A Test in Two Urban Samples

Propensity to offend is an important and stable predictor of offending. A person’s propensity is often thought of as a multidimensional trait consisting of morality and low self-control. The aim of this paper is to explain individual differences in propensity to offend as one single construct and two of its dimensions, namely morality and low self-control. It is well established that low levels of morality and low self-control increase the risk of offending. However, there is less empirical research that focuses on the main predictors of morality and self-control. Therefore the main research question for this study is to explain to what extent parental attachment, parental control and the school social bond have a direct effect on one’s propensity to offend (low morality or delinquency tolerance and low self-control). The data are drawn from two different samples of young adolescents in Antwerp, Belgium (N = 2,486), and Halmstad, Sweden (N = 1,003). The results show that parental control, parental attachment and the school social bond have direct effects on individual differences in propensity to offend, regardless of individual background variables. The results are highly equivalent in both samples. The similarity of the results across two independent samples suggests that the findings are stable. Implications for further studies are discussed.     

Neuropsychological Tests are Poor at Assessing the Frontal Lobes, Executive Functions, and Neurobehavioral Symptoms of Traumatically Brain-Injured Patients

The frontal lobes play a major role in the regulation of our emotions and behavior, planning, decision making, social conduct, actions, and executive functions. They are quite vulnerable to damage when an individual sustains a moderate or severe traumatic brain injury. Patients who sustain damage to their frontal lobes may not complain of any cognitive or neurobehavioral symptoms. They often do not show any abnormalities on standardized neuropsychological tests, particularly when the anterior and ventral areas of their frontal lobes are damaged. When these patients are observed in unstructured, novel, or complex real-world settings, they frequently exhibit cognitive difficulties, neurobehavioral symptoms, and problems with their executive functions. Since standardized neuropsychological tests are generally poor at assessing these problems and symptoms, neuropsychologists may not be aware of these problems if they have never observed these patients function in real-world settings or have never interviewed the significant others of these patients. As a consequence, neuropsychologists should not rely solely on the quantitative test data of these patients since it may provide inaccurate and misleading information.     

A New U.S.-Colombian Relationship: Transnational Crime and U.S. National Security

To fight transnational crime, the United States needs to strengthen its cooperation with Colombia. This initiative, according to the authors, will not only be cost-effective for the United States, it will also signal U.S. willingness to work “by, with and through” other states, and may make possible an expanded regional framework to act against the criminal cartels.     

Differences in Neuropsychological Functioning Between Homicidal and Nonviolent Schizophrenia Samples

Few studies have compared performance on neurocognitive measures between violent and nonviolent schizophrenia samples. A better understanding of neurocognitive dysfunction in violent individuals with schizophrenia could increase the efficacy of violence reduction strategies and aid in risk assessment and adjudication processes. This study aimed to compare neuropsychological performance between 25 homicide offenders with schizophrenia and 25 nonviolent schizophrenia controls. The groups were matched for age, race, sex, and handedness. Independent t‐tests and Mann–Whitney U‐tests were used to compare the schizophrenia groups’ performance on measures of cognition, including composite scores assessing domain level functioning and individual neuropsychological tests. Results indicated the violent schizophrenia group performed worse on measures of memory and executive functioning, and the Intellectual Functioning composite score, when compared to the nonviolent schizophrenia sample. These findings replicate previous research documenting neuropsychological deficits specific to violent individuals with schizophrenia and support research implicating fronto‐limbic dysfunction among violent offenders with schizophrenia.     

A 21st Century Developmentally Appropriate Juvenile Probation Approach

Principles of adolescent development have accelerated positive changes to the juvenile justice system. These changes have been most pronounced in reducing reliance on incarceration and in approaches to sentencing of youth tried as adults. While juvenile probation has made some developmentally friendly adjustments, it remains an area that is fertile for reform. Many of the principles and goals in this paper have been endorsed by the National Council of Juvenile and Family Court Judges (NCJFCJ), which “supports and is committed to juvenile probation systems that conform to the latest knowledge of adolescent development and adolescent brain science,” and which “recommends that courts cease imposing ‘conditions of probation’ and instead support probation departments’ developing, with families and youth, individualized case plans that set expectations and goals.” 1 NCJFCJ's July, 2017 resolution in support of developmentally appropriate juvenile probation services built on earlier NCJFCJ policies. From the time NCJFCJ adopted Juvenile Delinquency Guidelines in 2005, those policies have grown increasingly robust. 2