False-negative probability in the SEM/EDS automated discovery of iGSR particles: A Bayesian approach

The automated search software integrated with a scanning electron microscope (SEM/EDS) has been the standard tool for detecting inorganic gunshot residues (iGSR) for several decades. The detection of these particles depends on various factors such as collection, preservation, contamination with organic matter, and the method for sample analysis. This article focuses on the influence of equipment resolution setup on the backscattered electron images of the sample. The pixel size of these images plays a crucial role in determining the detectability of iGSR particles, especially those with sizes close to the pixel size. In this study, we calculated the probability of missing all characteristic iGSR particles in a sample using an SEM/EDS automated search and how it depends on the image pixel resolution setup. We developed and validated an iGSR particle detection model that links particle size with equipment registers and applied it to 320 samples analyzed by a forensic science laboratory. Our results show that the probability of missing all characteristic iGSR particles due to their size is below 5% for pixel sizes below 0.32 μm². These findings indicate that pixel sizes as large as twice the one commonly used in laboratory casework, that is, 0.16 μm², are effective for initial sample scanning, yielding good detection rates of characteristic particles that could exponentially reduce laboratory workload.     

Autosomal microsatellite data from Northwestern Colombia

Allele frequencies and some forensic parameters for 12 autosomal microsatellites (CSF1PO, TPOX, THO1, VWA, D16S539, D7S820, D13S317, D5S818, F13A1, FESFPS, F13B, LPL) were estimated from three departments from Northwestern Colombia. The total number of samples analysed was 1045 individuals.Comparative analysis among the three studied departments and with other published Colombian populations were also performed and discussed.     

Breaking point? An analysis of fatal stab wounds to the torso in Ireland between 2011 and 2018, examining the extent of rib fractures

This study examines the pattern of rib injuries occurring in cases of fatal torso stab wounds in Ireland between 2011 and 2018. It has been suggested by previous studies that rib fractures are not commonly sustained in stab wounds to the torso. We wanted to ascertain whether this was the case, as our data suggested that rib fractures were frequent, and where a rib is fractured there is a higher chance of organ injury and death, making this an important area of study. One hundred and forty seven cases of fatal stab wounds from an eight-year period were retrospectively reviewed. Fatal stab wounds to other body areas, were excluded; leaving a total of 104 cases with stab wounds to the torso. We found that 69.2% of cases had rib injuries, a figure significantly higher than previously reported. Our data suggests that stab wounds to the torso often fracture ribs, putting the underlying organs at increased risk of injury and perhaps contributing to fatality. The amount of force needed to cause a rib fracture can be difficult to quantify and indeed from the high percentage of rib fractures sustained in our data it appears that the ribs may be fractured regardless of the amount of force used; this is borne out by the finding that self-inflicted injuries also caused rib fractures. Our study shows that other factors, such as anatomical positioning and wound depth may have a greater bearing than force in terms of whether a rib fracture is sustained.     

Adolescent Girls’ Use of Avoidant and Approach Coping as Moderators Between Trauma Exposure and Trauma Symptoms

High rates of child maltreatment demand attention, as exposure to child maltreatment substantially increases the risk of developing PTSD. Some evidence exists that the presence of coping skills may reduce the likelihood that victims of childhood maltreatment will develop PTSD (Agaibi & Wilson, Trauma Violence Abuse 6:195–216, 2005). This study examined whether avoidant and/or approach coping skills moderated the relationship between childhood trauma exposure and trauma symptoms among adolescent females with a history of complex trauma. Results suggest that the use of avoidant coping moderates the relationship between trauma exposure and trauma symptoms. More specifically, girls with higher levels of trauma exposure demonstrated lower levels of trauma symptoms if they reported using higher levels of avoidant coping. Clinical implications for these results are discussed.     

Non-market Returns to Traditional Human Capital: Nutritional Status and Traditional Knowledge in a Native Amazonian Society

Soviet Agricultural and Peasant Affairs. Edited by Roy D. Laird London: Constable &; Co. 1964, xiv, 335 pp. 60/‐

India's Export Trends and the Prospects for Self‐Sustained Growth. By Manmohan Singh. Oxford, Clarendon Press, 1964, pp. xiv + 370. 45s.

The Political Economy of Mexico. By W. P. Glade and C. W. Anderson. University of Wisconsin Press, Madison, 1963. Pp. xii, 242, $5.