Evaluation of the Differex™ System

Differential extraction is an efficient method to separate sperm cells from epithelial cells. A manual Chelex^®-100 based method is used at the Swedish National Laboratory of Forensic Science, SKL. The Differex™ System (Promega) uses a Proteinase K digestion of epithelial cells followed by centrifugation and phase separation. The sperm- and epithelial fractions are further purified with DNA IQ™ System (Promega) or with phenol/chloroform. The Differex™ System in combination with DNA IQ™ System were evaluated and compared to the Chelex^®-100 method used routinely. After modifications, the Differex™ System gave comparable results to the Chelex^®-100 method. The modifications included additional Proteinase K and DTT, longer incubation time and additional steps when removing the solid support from the Digestion Solution. In the Chelex^®-100 based method microscopic examination is done on the sperm pellet in a total volume of 50 μl. It was not possible to do a microscopic examination in less than 100 μl using the Differex™ System. Additionally the sperms were in clusters of epithelial cell debris. Microscopic examination is an important part of the differential extraction at SKL. Therefore, the Differex™ System will not be implemented at our laboratory.     

Analyzing the Dynamics and Morphology of Cast‐off Pattern at Different Speed Levels Using High‐speed Digital Video Imaging

During a bloodstain pattern analysis, one of the essential tasks is to distinguish between different kinds of applied forces as well as to estimate their level of intensity. In this study, high‐speed digital imaging has been used to analyze the formation of cast‐off patterns generated by a simulated backswing with a blood‐bearing object. For this purpose, 0.5 mL blood was applied evenly over the last 5 cm of a blade simulant. Bloodstains were created through the controlled acceleration of a backswing at different speed levels between 1.1 m/sec and 3.8 m/sec. The flight dynamics of blood droplets were captured with an Olympus^® i‐Speed 3 high‐speed digital camera with a Nikon^® AF Nikkor 50 mm f/1.8 D lens and analyzed using the Olympus i‐Speed 3 Viewer software. The video analysis showed that, during the backswing, blood droplets would move toward the lower end of the knifepoint and would be tangentially thrown off. These droplets impacted on the horizontal surface according to the arc of the swing. An increase in velocity led to longer cast‐off patterns with distinct morphological characteristics. Under laboratory conditions, bloodstain pattern analysis allows certain conclusions about the intensity of a backswing and provides instructions on the position of the offender. However, due to the number of unknown variables at a crime scene, such interpretation of cast‐off patterns is extremely limited and should be performed with extreme caution.     

When Both Sides are Mistaken: Layperson and Legal Professionals’ Misconceptions of Canadian Suspects’ Legal Rights Upon Arrest

Canadian criminal suspects have notably limited access to legal counsel upon arrest compared to suspects in the U.S. Additionally, prior research has shown significant misunderstanding of police warnings informing suspects of their rights upon arrest. This paper presents three studies on Canadians’ comprehension of criminal suspects’ rights upon arrest, with a focus on the right to counsel. Study 1 (N=80) and Study 2 (N=377) examined Canadian layperson’s comprehension, knowledge, and perceptions of legal rights upon arrest. In turn, Study 3 (N=78) investigated Canadian legal professionals’ perceptions of laypersons’ knowledge of those rights. Results from these three studies indicated there is substantial confusion about the right to counsel for Canadian criminal suspects. These results also support previous research demonstrating problems with comprehension of Canadian police cautions. Taken together, the findings of the present research pose significant concern for an increased risk of false confessions from Canadian suspects who enter an interrogation with limited knowledge and understanding of their legal right to counsel.     

Shulamit Almog,How Digital Technologies are Changing the Practice of Law

International Journal for the Semiotics of Law - Revue internationale de Sémiotique juridique -     

Myths and Mild Traumatic Brain Injury

Despite the fact that patients with mild traumatic brain injuries (TBI) are commonly encountered in clinical practice, there are numerous myths surrounding their diagnosis, assessment, and outcome. The purpose of this paper is to review some of the more common myths related to mild TBI including: (a) there is no Miserable Minority; (b) meta-analytic studies have proven that patients with mild TBI do not experience persistent deficits; (c) personality tests can reliably capture psychological problems in patients with a mild TBI; (d) findings from the sports concussion literature can be directly applied to clinical patients; and (e) in the absence of loss of consciousness, the diagnosis of a mild TBI is uncertain.     

Dysfunctional Parenting and Intimate Partner Violence Perpetration and Victimization among College Women: the Mediating Role of Schemas

Early Maladaptive Schemas (EMS) are negative cognitions about self and relationships that develop early in life, distort our perceptions of life experiences and are sustained via confirmatory information processing (Young et al. 2003). Although empirical evidence supports the relationship between EMS and psychopathology, there is a relative paucity of research regarding the relationship between EMS and intimate partner violence (IPV). The goal of the present study was to elucidate the complex relations between recollections of dysfunctional parenting, EMS, and IPV victimization and perpetration in adulthood. A sample of 305 women college students completed measures of perceptions of parental bonding, EMS, and relationship conflict behaviors. Results revealed that the EMS of subjugation and self-sacrifice accounted for 13.9% of the variance in IPV victimization; however, the EMS of subjugation was the only significant predictor of IPV victimization and mediated the relationship between recollections of dysfunctional parenting and IPV victimization. Additionally, although the EMS of entitlement, insufficient self-control, mistrust/abuse, abandonment, and social isolation accounted for 11.3% of the variance in IPV perpetration, only the EMS of insufficient self-control and mistrust/abuse were significant predictors of IPV perpetration and mediated the relationship between recollections of dysfunctional parenting and IPV perpetration. Results suggest that these cognitive schemas may be the mechanism through which dysfunctional parenting renders one vulnerable to violence in relationships.     

Disproportionate minority contact in the juvenile justice system: An investigation of ethnic disparity in program referral at disposition

Historically, minority youth have experienced harsher punishments and more negative outcomes than White youth even when risk assessment is used. The current study investigated the role of ethnicity in an understudied dispositional decision–program referral–and the outcomes associated with said referral using a sample of juvenile offenders (N = 2,678). The study used the Youth Level of Service/Case Management Inventory (YLS/CMI) to determine (1) if ethnicity predicted program referral when accounting for risk assessment and (2) if program referral predicted recidivism. Results indicated that ethnicity predicted program referral, and program referral predicted recidivism. Future directions for Disproportionate Minority Contact (DMC) research and implications for court officials are discussed.     

Detection of drug transport using X-ray techniques

The purpose of the paper was to show X-ray techniques used to discover drugs transported inside the body (body packers), on the body surface, in the garments or luggage, in goods and vehicles. The analysis was based on the X-ray findings of 141 body packers caught in Hamburg between 1989 and 2004 as well as individual cases from personal collections. The use of X-rays for border and security checks is described, different technical concepts are demonstrated and examples are given, e. g. transmission (fluoroscopic) and backscatter imaging of humans, luggage, goods, and vehicles as well as X-ray spectroscopy. The results showed that body packers produce characteristic findings in native X-ray photographs, which are even more pronounced in CT scans and after application of contrast media. Backscatter imaging allows the investigation of the body surface and the clothing. Transmission and backscatter imaging is suitable for checking humans, goods, passenger cars, trucks and containers. With the help of X-ray spectroscopy suspicious substances can be identified without opening the packaging material. According to present findings, the radiation dose applied seems low compared with exposure to environmental radiation and cosmic radiation during flights. The pictures obtained with the backscatter technique show the person checked in the nude, which raises the question of privacy versus the right of the state to carry out inspections and controls.