Testing Discriminant Functions for Sex Determination from Deciduous Teeth*,†

Abstract: Three studies have proposed discriminant functions for sex determination from deciduous tooth crown dimensions, and this study tests the existing functions on a sample of 46 Portuguese immature skeletons of known sex, aged from birth to 10 years. Deciduous teeth were measured in their mesiodistal and faciolingual crown dimensions, and percentage of correct allocation accuracy in determining sex using each specific function was determined. Discriminant functions were also calculated from data collected for this study and tested using cross‐validation. Results show poor overall accuracy (33.3–75%) and poor cross‐validation (46.2–60.0%). This is related to low sexual dimorphism in deciduous tooth crown size, as well as differences in degree of sexual dimorphism and in overall tooth size between different samples. For these reasons, deciduous crown size does not seem to show significant forensic value as discriminator of sex, particularly when methods developed on one population are applied to individuals of another population.     

中性业务行为的意义、标准及立场选择

在现代技术环境下,社会分工协作日趋复杂,为保护个人的信赖利益,基于帮助犯免责事由的中性业务行为应运而生。中性业务行为确定了帮助行为可罚与不可罚的边际,是对传统的帮助犯理论的修正和例外,是法益保护与权利保障平衡的产物。     

Mentally ill offenders eligible for diversion at local court in New South Wales (NSW), Australia: factors associated with initially successful diversion

Diversion away from the criminal justice system and into mental health treatment services is a key strategy for addressing the well-established burden of mental illness suffered by those presenting to court. While mental health courts, court liaison and court diversion services have been developed in many jurisdictions internationally, there is limited research evidence to support their effectiveness in identifying those with mental health need and achieving successful diversion. The Statewide Community and Court Liaison Service in New South Wales, Australia, identifies mentally ill offenders likely to meet legal eligibility criteria for diversion at the busiest local courts across the state. Utilising data collected by mental health clinicians working in the service, 8317 individuals were identified as being eligible for court diversion on at least one occasion during the study period (1 July 2008 and the 30 June 2015) and 57.3% were subsequently diverted by Magistrates. Successful diversion at this first step was associated with being female, older, of non-Aboriginal and/or Torres Strait Islander background, and having a serious mental illness, replicated when stratified by sex and by Aboriginal and/or Torres Strait Islander background. There may be barriers to mental health diversion at court for individuals with particular socio-demographic characteristics which future service developments may need to take into account.     

All part of the process? A qualitative examination of change in online child pornography behaviors

Over the past two decades, there has been increased attention on offending behaviors and motivations of child pornography offenders (CPOs). Although existing research has provided a knowledgeable foundation in regard to this offending subpopulation, the literature has been relatively limited on examining changes in offender behaviors and motivations. This study used interviews with 25 online CPOs in a southern state to identify themes underlying offending behaviors and motives at onset, as well as, continuation of offending over time. We found that offenders reported various circumstances (ranging from intentional to unintentional) and motivations (including thrill-seeking and attraction) at onset; however, CPOs reported thrill-seeking and attraction to be the most common factors driving their continued offending. We applied these themes to the existing literature on child pornography offending and recommended directions for future research. Based on our findings, we offered considerations for the treatment of CPOs.     

The community corrections perspective toward sex offender management policies and collateral consequences: does contact with sex offenders matter?

Since the 1990s, numerous policies have been enacted aimed at managing sex offenders in the community. Two of the most prominent management policies are registries for sex offenders and residence restrictions. Community corrections professionals are tasked with enforcing these policies and yet little is known about their perceptions toward sex offenders and the policies in place to manage them. Prior research has suggested that contact with sex offenders may place a significant role in shaping the attitudes of community corrections professionals toward sex offender management policies and collateral consequences. The current study investigates the effect of contact with sex offenders on the perceptions of community corrections professionals (n = 209) toward sex offender management policies and collateral consequences faced by sex offenders. Findings suggest that contact with sex offenders does not influence the attitudes of community corrections professionals, but several other significant factors were revealed including parental status, political orientation, race, tenure, sex, and age.     

An Investigation into the Relationship between Human Cranial and Pelvic Sexual Dimorphism

When faced with commingled remains, it might be assumed that a more “masculine” pelvis is associated with a more “masculine” cranium, but this relationship has not been specifically tested. This study uses geometric morphometric analyses of pelvic and cranial landmarks to assess whether there is an intra‐individual relationship between the degrees of sexual expression in these two skeletal regions. Principal component and discriminant function scores were used to assess sexual dimorphism in 113 U.S. Black individuals. Correlation values and partial least squares regression (PLS) were used to evaluate intra‐individual relationships. Results indicate that the os coxae is more sexually dimorphic than the cranium, with element shape being more sexually dimorphic than size. PLS and correlation results suggest no significant intra‐individual relationship between pelvic and cranial sexual size or shape expression. Thus, in commingled situations, associations between these skeletal elements cannot be inferred based on degree of “masculinity.”     

A Validation Study of the Langley et al. (2017) Decision Tree Model for Sex Estimation

Langley et al. (2017) developed a sex estimation decision tree utilizing two traditional cranial traits (glabella and mastoid) and a new trait: zygomatic extension. This study aimed to test the reliability of their zygomatic extension scoring method and validate their sex estimation method. Ordinal score data were collected from 281 male and female U.S. White and Black individuals. The five traditional cranial traits were collected from physical specimens, while zygomatic extension was scored from 3D cranial models. Intra‐ and interobserver analyses carried out on a subsample of 30 individuals indicate good agreement between zygomatic scores. The decision tree correctly sexed 71.5% of the sample, but a strong sex bias (94.2% correct for females, 49.3% correct for males) severely limits the utility of this method. The Walker (2008) and Stevenson et al. (2009) methods produced higher accuracy rates (80.8% and 82.6%, respectively), although these methods also produced sex and ancestry biases.     

Application of the Optimized Summed Scored Attributes Method to Sex Estimation in Asian Crania

The optimized summed scored attributes (OSSA) method was recently introduced and validated for nonmetric ancestry estimation between American Black and White individuals. The method proceeds by scoring, dichotomizing, and subsequently summing ordinal morphoscopic trait scores to maximize between‐group differences. This study tests the applicability of the OSSA method for sex estimation using five cranial traits given the methodological similarities between classifying sex and ancestry. A large sample of documented crania from Japan and Thailand (n = 744 males, 320 females) are used to develop a heuristically selected OSSA sectioning point of ≤1 separating males and females. This sectioning point is validated using a holdout sample of Japanese, Thai, and Filipino (n = 178 males, 82 females) individuals. The results indicate a general correct classification rate of 82% using all five traits, and 81% when excluding the mental eminence. Designating an OSSA score of 2 as indeterminate is recommended.     

应用枕骨大孔面积判定性别的研究进展

性别是个体识别的主要生物学指标之一,是法医学鉴定不明骨骼残骸的重要初始步骤。枕骨大孔因其解剖学位置的隐匿性、形态学的稳定性、性别与种族的差异性成为法医学性别判定的研究热点,其中枕骨大孔面积是枕骨大孔区域中进行性别判定准确率较高的指标之一。本文以枕骨大孔面积为主要研究对象,就国外学者通过干颅骨样本、CT影像、CBCT影像测量枕骨大孔面积判定性别的方法进行总结,对国内应用枕骨大孔面积进行性别判定研究提供参考。     

Female sex offenders who abuse children whilst working in organisational contexts: offending,conviction and sentencing

To date, there has been very little research into the phenomenon of female-perpetrated institutional child sexual abuse (CSA). This study explored 71 cases of CSA perpetrated by women working with children, considered by UK police and courts between 2000 and 2016. Qualitative and quantitative content analysis was employed to examine court reports, professional regulatory body decisions, media reports and an online sentencing database in order to identify perpetrator and victim characteristics, the nature of the offending behaviour, modus operandi and criminal justice system responses. Findings indicate most women offended alone and had no previous criminal or employment records of concern. Victims were typically male and 15–16 years old. Most women received custodial sentences, typically of 2–3 years in length. Implications for policy and practice are also discussed.