Persistence of Biological Traces at Inside Parts of a Firearm from a Case of Multiple Familial Homicide

Backspatter from wounds caused by contact shots against a biological target had before been shown to be propelled into firearms' barrels where they can persist and be retrieved from as relevant forensic evidence. Herein, that insight was applied to the investigation of a case of multiple familial homicide with a firearm. Samples of backspatter were collected from the firearm using DNA‐free swabs. DNA was extracted from the swabs, and 16 STR systems were PCR‐amplified to generate DNA profiles of all victims shot by the firearm. The quality of the resulting DNA profiles was sufficient to exclude the perpetrator as donor and to differentiate the three closely related victims thereby proving that all three victims had been shot by the same firearm from very close or contact distance. A key insight gained from this case was that not only a firearms' barrel inside but other inner surfaces may be charged with profilable DNA.     

The Effect of Previous Traumatic Injury on Homicide Risk

Research has reported that a strong risk factor for traumatic injury is having a previous injury (i.e., recidivism). To date, the only study examining the relationship between recidivism and homicide reported strong associations, but was limited by possible selection bias. The current matched case–control study utilized coroner's data from 2004 to 2008. Subjects were linked to trauma registry data to determine whether the person had a previous traumatic injury. Conditional logistic regression was used to estimate odds ratios (ORs) and 95% confidence intervals (95% CIs) for the association between homicide and recidivism. Homicide risk was increased for those having a previous traumatic injury (OR 1.81, 95% CI 1.09–2.99) or a previous intentional injury (OR 2.53, 95% CI 1.24–5.17). These results suggest an association between homicide and injury recidivism, and that trauma centers may be an effective setting for screening individuals for secondary prevention efforts of homicide through violence prevention programs.     

Evaluation of police recruit training involving psychology

Abstract

Claims have been made that critical thinking is a necessary skill for constructing accurate offender profiles. However, in studies purporting to demonstrate this, critical thinking ability amongst participants has never been adequately assessed, making it impossible to draw any valid conclusions about the importance of this skill for profiling. In order to empirically examine the relationship between critical thinking ability and profile accuracy, participants (n=36) in the current study completed a mock profiling exercise and the Watson–Glaser Critical Thinking Appraisal – Form S (WGCTA-S). Profile accuracy scores were calculated for each participant and correlated with his or her scores on the WGCTA-S. Although the majority of participants were found to be adequate critical thinkers, no significant relationship was found between critical thinking ability and profile accuracy. Potential explanations for this finding are discussed.     

A systematic review of the literature comparing male non-serial sexual killers and sexual aggressors: examining homogeneous and heterogeneous characteristics of these groups

ABSTRACT

This systematic review considers what is known about the characteristics of sexual killers and sexual aggressors. The aim was to identify which characteristics have consistently been shown to be similar (homogeneous) and which are different (heterogeneous) across these two groups. Ten studies, including approximately 300 sexual killers, were analysed. Only studies where the samples were directly compared and where sexual killers were male, predominantly non-serial and perpetrated against adult female victims were included. Results indicate that levels of loneliness and anger appear to be more prevalent in the sexual killer sample while mental health disorders, criminal history, family structure and history of sexual abuse as well as some crime scene behaviours seem to be similar across the two groups. The results of this review have also highlighted some methodological problems inherent to these types of studies and these issues are discussed from the perspective of improving research on these crimes.     

Understanding sexual homicide

Abstract

Sexual homicide is a crime that receives much media attention, but one that still has a relatively small research base compared to other crimes. Although the idea of someone deriving sexual gratification from or during the killing of another is an anathema to many, forensic professionals need to understand sexual homicide and the range of circumstances and motivations that lie behind it. This paper explores this complex crime: it illustrates the various definitions and labels used; it suggests that sexual homicide is rare and is committed by individuals who, although having troubled histories, may not differ from other offenders. Then, by examining the various legal and behavioural circumstances in which sexual homicide can occur, this paper illustrates the diversity of sexual homicide and presents it in a more understandable manner. Finally, the paper suggests that knowledge of this diversity is required both for investigative and clinical purposes.     

边缘与边缘化:城市化进程中失地农民的生活——基于浙江长兴县的实证调查

文章选取浙江长兴县两个具有代表性的拆迁自然村,进行调研与实证性分析,认为失地农民的社会角色从农民转换到城市居民,居住形态、就业方式、消费方式、社交方式、休闲方式等都发生了明显变化。失地农民存在被边缘与边缘化的现实困境,"新市民"的角色确定需要一个较长的过程。提出政府应为失地农民的可持续生计提供政策支持;加强对新市民迁居前后社会安全管理;构建和谐人居环境增强新市民社区归属感等建议。     

Murder Followed by Suicide: Filicide–Suicide Mothers in Italy from 1992 to 2010

The international literature shows that in 40–50% of the cases, homicides–suicides involving children under the age of 10 are committed by mothers. Here, we report some results on homicides–suicides, in the mother–child relationship, occurred in Italy between 1992 and 2010. We examined 36 cases of filicide–suicide mothers by consulting the archives of RAI, daily newspapers, and the ANSA news agency. We focused on: mothers and children's age, place of residence, date and place of the murder, number and sex of the murdered children, and modality of the homicide–suicide. At the time of the homicide–suicide, the average age of mothers was 35.4. The number of children killed by each mother was one, except in seven cases. All the women had underestimated psychopathological disorders and only six women were regularly treated. The dynamics and characteristics of the events were much more similar to suicides than homicides, so we can consider them as “extensive suicides.”     

The Toxicology of Methadone‐Related Death in Infants Under 1 Year: Three Case Series and Review of the Literature

Methadone‐related fatalities occur rarely in infants under 1 year, with five confirmed cases in the literature. The interpretation of pediatric postmortem toxicology relies on adult data; however, infants have crucial physiological differences that may impact interpretation of results. Retrospective case review included scene investigation, interviews, autopsy, and NIH/CDC Sudden Unexplained Infant Death Investigation Reporting Form. Methadone levels were confirmed by liquid chromatography/tandem mass spectrometry (LC‐MS/MS). The fatal blood methadone levels in this case series ranged from 69 to 700 ng/mL. This review of the literature adds toxicological findings of three methadone‐related infant fatalities and reviews the current literature on methadone‐related death in infants under 1 year. With opioid use on the rise in today's society, forensic experts should have a high index of suspicion for the possibility of intentional or unintentional poisoning in infants.     

Sexual Homicide by Older Male Offenders

Recent research has expanded our understanding of sexual homicide offenders (SHOs). However, little exists beyond case reports for older SHOs. We characterized male SHOs ≥ 55 years, comparing them to typical adult male SHOs who are in their 20s. Analysis of 37 years (1976–2012) of US Supplementary Homicide Reports data provided a large SHO sample (N = 3453). Three case reports provide clinical context for the diverse nature and patterns of older SHOs. Only 32 older male SHOs and no older female SHOs were identified. Murders by older SHOs accounted for only 0.5% of US sexual homicides. Unlike typical SHOs that generally target young adult females, over two‐thirds of older SHO victims were ≥40 years, and one‐third were ≥55 years. Sexual homicides by older SHOs, like sexual homicide in general, decreased over the study period. These crimes, while exceedingly rare, do occur, warranting special consideration.