Single source DNA profile recovery from single cells isolated from skin and fabric from touch DNA mixtures in mock physical assaults

The ability to obtain DNA profiles from trace biological evidence is routinely demonstrated with so-called ‘touch DNA evidence’, which is generally perceived to be the result of DNA obtained from shed skin cells transferred from a donor's hands to an object or person during direct physical contact. Current methods for the recovery of trace DNA employ swabs or adhesive tape to sample an area of interest. While of practical utility, such ‘blind-swabbing’ approaches will necessarily co-sample cellular material from the different individuals whose cells are present on the item, even though the individuals' cells are principally located in topographically dispersed, but distinct, locations on the item. Thus the act of swabbing itself artifactually creates some of the DNA mixtures encountered in touch DNA samples. In some instances involving transient contact between an assailant and victim, the victim's DNA may be found in such significant excess as to preclude the detection and typing of the perpetrator's DNA. In order to circumvent the challenges with standard recovery and analysis methods for touch DNA evidence, we reported previously the development of a ‘smart analysis’ single cell recovery and DNA analysis method that results in enhanced genetic analysis of touch DNA evidence. Here we use the smart single cell analysis method to recover probative single source profiles from individual and agglomerated cells from various touched objects and clothing items belonging to known donors. We then use the same approach for the detection of single source male donor DNA in simulated physical contact/assault mixture samples (i.e. male ‘assailant’ grabbing the wrist, neck or clothing from the female ‘victim’, or being in transient contact with bedding from the ‘victim’). DNA profiles attributable to the male or female known donors were obtained from 31% and 35% of the single and agglomerated bio-particles (putative cells) tested. The known male donor ‘assailant’ DNA profile was identified in the cell sampling from every mixture type tested. The results of this work demonstrate the efficacy of an alternative strategy to recover single source perpetrator DNA profiles in physical contact/assault cases involving trace perpetrator/victim cellular admixtures.     

Policing image-based sexual abuse: stakeholder perspectives

ABSTRACT

Image-based sexual abuse (IBSA) refers to the non-consensual recording, distribution, or threat of distribution, of nude or sexual images. Over the past five years, numerous jurisdictions have amended their criminal laws to respond more effectively to this growing phenomenon, yet increased criminalization has not automatically translated into increased prosecutions. Drawing on stakeholder interviews with 52 Australian legal and policy experts, domestic and sexual violence advocates, industry representatives, police, and academics, this article examines law enforcement responses to IBSA in Australia. We argue that although there is evidence to suggest IBSA is being treated more seriously by police, there are five primary barriers to responding to IBSA, including: inconsistent laws; a lack of resources; evidentiary limitations; jurisdictional boundaries; and victim-blaming or harm minimization attitudes. Suggestions are made for how to respond to these challenges to facilitate more effective policing of IBSA.     

Why do men rape? Understanding the determinants of rapes in India

Abstract

The study examines the determinants of rapes in India using state-level data for the time period 2001–2015. The panel model analysis indicates that there is no impact of education and economic growth, pointing towards a larger role of social and cultural factors in this context. The effect of deterrence variables (such as the number of police stations) is non-existent, possibly pointing towards the incompetency of the police force. Social attitude towards women emerged as the most robust predictor of the extent of rapes in India. We argue that the fundamental problem lies in the misogyny deeply rooted in the Indian society.     

Toward a comprehensive theory of child sexual abuse: A theory knitting perspective

Abstract

In recent years a number of multifactorial theories of child sexual abuse have been developed. The most influential are Finkelhor's (1984) Precondition Model of child sexual abuse; Hall and Hirschman's (1992) Quadripartite Model; and Marshall and Barbaree's Integrated Theory (1990). While all three of these important theories have a number of strengths, each has serious weaknesses that limit its ability to provide a satisfactory explanation of child sexual abuse. In this paper we attempt to integrate the best elements of the three theories into a comprehensive etiological theory, or at least the beginnings of such a theory. After outlining the concept of theory knitting we briefly summarise each of the multifactorial theories and their major strengths and weaknesses. We then develop a comprehensive theoretical framework (the Pathways Model) integrating both the overlapping and unique elements of these broad perspectives with some additional concepts derived from various psychological domains. In the final section of the paper we consider the adequacy of the Pathways Model.     

A critique of hall and hirschman's quadripartite model of child sexual abuse

Abstract

The aim of the current article is to critically examine an extremely influential multi-factorial theory of child molestation. Hall and Hirschman's (1992) quadripartite model. This innovative model was originally presented as a theory of rape and later extended to explain the onset of child sexual abuse. Despite its prominent status the adequacy of its basic ideas have never been systematically evaluated. First, I describe the quadripartite model in detail and outline its core assumptions. Next, these ideas are subject to critical analysis and I highlight its strengths and weaknesses. Finally, I conclude with some brief comments about the model and the role of theory development in the sexual offending area.     

Differentiating sexual violence: A comparison of sexual homicide and rape

Abstract

The present study sought to identify consistent patterns in the actions of sexually violent offenders to determine whether sexual homicide and rape reflect different behavioral emphasis of a single thematic model of sexual assault. Crime scene behaviors of 74 (37 sexual homicides and 37 rapes) solved cases of sexual assaults were compared, and results of a multi-dimensional analysis revealed three thematic styles of interacting with the victim during a sexual assault (Exploit, Control, and Violent). Further analysis indicated that offender–victim interactions in sexual homicide and rape are predominantly distinguished by the degree of violence, such that behaviors associated with each type of offense were found to occur in two discrete areas along a single continuum. Findings are discussed in terms of producing a general framework for understanding sexual violent interactions.     

Examining the effectiveness of a UK community-based sexual offender treatment programme for child abusers

Abstract

An analysis of psychometric data from a sample of 341 UK child abusers who had completed a probation-based sex offender treatment programme was carried out in order to assess the effectiveness of therapeutic treatment. A cluster analysis was also undertaken to examine the pattern of pre-treatment problems. Three clusters of offenders, with distinctly different psychometric profiles, were identified depending upon the number and extent of their offence-specific and social adequacy problems. These were labelled Low need, Medium need and High need. Pre–post analyses revealed clinically significant treatment effects for the entire sample, with differing effects found across the clusters as follows: 50–81% of the Low need group scored within the cut-off (or normative range) at the post stage, while between 3% and 26% had shifted to a clinically significant degree; 34–75% of the Medium need group scored within the cut-off range after treatment, while between 9% and 100% had shifted to a clinically significant degree; 16–52% of the High need sample scored within the cut-off at the post-treatment stage, and between 15% and 80% had shifted to a clinically significant degree.     

Children's testimony: Research findings and policy implications

Abstract

Traditionally the British legal system has taken a sceptical attitude toward the testimony of children, reflected in the competency requirement, the corroboration rule and the judicial caution. However, recent psychological research has suggested that children, properly interviewed, can provide invaluable testimony in securing convictions in cases of sexual or physical abuse. Research suggests that children's spontaneous accounts of events are generally accurate, and that suggestibility can be greatly reduced by appropriate questioning techniques. Partly as a result of such research, the legal hurdles surrounding children's evidence have been dismantled and procedural innovations, such as the use of the Videolink and videotaped interviews introduced. Empirical research demonstrates the success of the Videolink and a similar evaluation is planned for videotaped interviews. The latter has highlighted the need for a new research agenda which would include the impact of biased or repeated questioning, and requests to children from abusers to lie or keep secrets.     

Sexual and violent recidivism by offender type and actuarial risk: reoffending rates for rapists,child molesters and mixed-victim offenders

Abstract

The current study examines sexual and violent reoffence rates for a sample of 2474 sexual offenders over an average of 15 years following release from prison. Reoffence rates are reported as a function of the offenders' victim type and level of risk as assessed by the Automated Sexual Recidivism Scale, a computer scored measure of relevant historical risk factors. Observed sexual recidivism rates for offenders with child victims, adult victims, and mixed victims were quite similar. Results indicate that offenders with exclusively female child victims not only showed a lower rate of sexual reoffending, but that the reoffence rates were relatively low across all levels of actuarial risk. In contrast, those with male child victims and adult victims showed a pronounced escalation of reoffence rates as actuarial risk increased. Results also indicated that adult victim offenders are less consistent in the victim type of their reoffences, with 37% sexually reoffending against child victims. Finally, combined rates of sexual and violent reoffending were particularly high for those with adult victim sexual offence histories. Risk assessment and public policy implications are discussed.