Bloodstain age estimation through infrared spectroscopy and Chemometric models

The chemical profiling of bloodstains is essential to link the suspect with the crime. The current study proposed a proof-of-concept methodology for the investigation of bloodstains by utilizing advanced ATR-FTIR spectroscopy coupled with new generation chemometric methods. Current study provides encouraging data to allow discrimination between human and animal blood though with small sample size. In this study, different models for the age estimation of human bloodstains are developed from the trained data sets of 1–175 days old bloodstains. The models such as curve estimation (CE), multiple linear regression (MLR), and partial least squares regressions (PLSR) are developed to determine the best prediction model for aged human bloodstains. The obtained results on the dating of bloodstains are very encouraging and also tested for unknown samples. The maximum dating errors are observed in the curve estimation models whereas, the other models MLR, PLSR show excellent age estimation of unknown bloodstains. These models represent an error of ~3 ± 1 days and ~4 ± 1 days in actual and estimated date, respectively, which is lowest ever reported so far. The present methodology is expected to provide a valuable insight into forensic society and hence, to the law enforcement community. The present methodology can further be explored for an ideal model by including all other external variables/factors and for more longer aging time.     

Detection of Inflicted Bruises by Alternate Light: Results of a Randomized Controlled Trial

Bruises are often difficult to detect on victims of violence, potentially impacting investigation and prosecution. The purpose of our randomized controlled trial was to measure the effectiveness of an alternate light source (ALS) within visible and long ultraviolet spectrums at improving bruise detection compared to white light over time. We also examined the effects of skin color, age, gender, localized fat, and injury mechanism on bruise detection. Participants included 157 healthy adults with balanced sampling across six skin color categories. Bruises were created under the controlled application of a paintball pellet and dropped weight to one upper and lower arm, respectively. Using a crossover design, both bruises were examined 21 times over 4 weeks. Ten different wavelength (350–535 nm) and filter (yellow, orange, red) combinations were used. Multilevel models were used to analyze 2903 examinations on both upper and lower arms. Results in multivariable models showed after controlling for other covariates 415 and 450 nm using a yellow filter had greater odds of detecting evidence of bruising than white light (Upper Arm: 415 nm: OR = 5.34, 95% CI: 4.35–6.56; 450 nm: OR = 4.08, 95% CI: 3.36–4.96). Under either light source, being female and having more localized fat had increased odds of detecting bruises created by the dropped weight (female: OR = 2.96, 95% CI: 2.37–3.70; fat: OR = 1.21, 95% CI: 1.09–1.34). Our results support ALS as an appropriate tool to enhance concurrent physical assessment of bruises in the presence of known history of injury. Future development and evaluation of clinical practice guidelines for ALS application are needed.     

Dating Violence Victimization,Relationship Satisfaction,Mental Health Problems,and Acceptability of Violence: A Comparison of Men and Women

Two of the most common reported consequences of dating violence are its impact on the victim’s satisfaction with their romantic relationship and its impact on the victim’s mental health. Recent research suggests that the strength of these relationships may be moderated by the degree to which the dating violence is acceptable to the victim. However, studies of these relationships have been limited to samples of women. The purpose of the present research was to examine the relationships among dating violence victimization, relationship satisfaction, mental health problems, and acceptability of violence for a sample that includes not only female victims, but also male victims. Using a sample of 155 male and 417 female college students, hierarchical regression analyses found that dating violence victimization is associated with relationship satisfaction and mental health problems for both men and women. For men, acceptability of violence moderated the relationship between dating violence victimization and the mental health problems of depression, anxiety, and somatization. For women, acceptability of violence moderated the relationship between dating violence victimization and relationship satisfaction only.

Does Acceptability of Violence Impact the Relationship Between Satisfaction,Victimization, and Commitment Levels in Emerging Adult Dating Relationships?

This study examined the impact of acceptability of violence on dating violence victimization, relationship satisfaction, and relationship commitment. A survey administered to a sample of 155 male and 417 female college students showed that relationship satisfaction was significantly associated with relationship commitment, but that dating violence victimization was not. Moreover, acceptability of violence emerged as a significant moderator of the relationship between satisfaction and commitment in dating relationships when gender differences were assessed. Discussion of these findings and future research are included.

The relationship between social support and adolescent dating violence: a comparison across genders

Although much research has focused on the function of social support in adult intimate partner violence, little is known about the role of social support in adolescent dating violence. This study is an exploratory analysis of the independent impact of social support from friends and family on the risk of adolescent dating violence perpetration and victimization among a large sample of youth (n = 970). Approximately, 21% of the sample reported experiencing victimization in a dating relationship whereas 23% indicated perpetrating dating violence. Male youth reported significantly more involvement in dating violence as both perpetrators and victims. Negative binomial regression modeling indicated that increased levels of support from friends was associated with significantly less dating violence perpetration and victimization; however, when gendered models were explored, the protective role of social support was only maintained for female youth. Family support was not significantly related to dating violence in any model. Implications for dating violence curriculum and future research are addressed.     

Sexual relationship power as a mediator between dating violence and sexually transmitted infections among college women

This study examined relationship power as a possible mediator of the relationship between dating violence and sexually transmitted infections (STIs). The proposed mediation model was based on the theory of gender and power as well as previous research on intimate partner violence and STI risk. Survey results from a sample of 290 single, undergraduate women indicated that 85% experienced at least one form of dating violence victimization in the past year, 5.9% tested positive for an STI, and 5.2% received treatment for an STI. Results revealed that women with lower levels of sexual relationship power had higher rates of dating violence victimization and STIs; also, sexual relationship power partially mediated the relationship between dating violence victimization and STIs. Future dating violence and STI-prevention interventions targeting young women may want to use an empowerment approach to decrease their likelihood of dating violence victimization and STI risk.     

Child Adjustment after Parental Separation: Variations by Gender,Age, and Maternal Experiences of Violence during Marriage

This study examined variations in children’s post-separation adjustment based on child characteristics (gender and age) and maternal experiences of intimate partner violence (IPV) during marriage. Mothers (N?=?147) recruited within 12 weeks of a divorce filing took part in two interviews three months apart. They reported on marital IPV at Time 1, and their children’s (47% female; ages 3–17) adjustment 3 months later at Time 2. Four aspects of child adjustment were assessed using a standardized measure (hyperactivity, emotional symptoms, conduct problems, peer problems). Mothers were classified as having experienced coercive controlling violence (CCV; 23.8%), situational couple violence (SCV; 27.9%), or no violence (48.3%) during marriage. Gender differences were found on one of the four child adjustment indicators: boys had higher levels of hyperactivity than girls. Among boys but not girls, hyperactivity scores varied based on age and IPV type. Implications for practitioners and researchers are discussed.

     

Dating violence and girls in the juvenile justice system

The purpose of this study is to explore the prevalence and associated behaviors of dating violence among a population of girls in the juvenile justice system. A sample of 590 girls from an urban juvenile justice system completed a questionnaire assessing attitudes and self-efficacy about and occurrence of dating violence. The analysis developed a random effect model to determine a risk profile for dating violence. The strongest predictors of dating violence were (a) initial sexual experience at age 13 or earlier, (b) unwillingness of initial sexual experience, (c) drug use, and (d) low self-efficacy about preventing dating violence. The high prevalence of dating violence and associated behaviors among participants suggests the importance of implementing primary prevention programs to assist preteen girls in delaying initial sexual intercourse and in learning techniques to prevent dating violence.     

Dating violence among college men and women: evaluation of a theoretical model

This study empirically evaluates the Riggs and O'Leary (1989) model of dating violence. A sample of 200 college students completes assessments concerning the occurrence of violence in their dating relationships. The incidence of self-reported partner violence is 25% for women and 10% for men. Multivariate logistic regression analyses are performed to determine the most salient predictors of dating violence for each gender. Findings reveal that the model is more accurate in predicting female, as compared with male perpetration of dating violence. The model accurately classifies 83% of violent women and only 30% of violent men. This study has several implications for the field of dating violence. Results indicate that although there is some degree of overlap, variant constructs predict violence for each gender. Identifying these constructs will guide prevention efforts in more effectively decreasing the occurrence of dating violence.     

Predictors of dating violence among Chinese adolescents: the role of gender-role beliefs and justification of violence

In Chinese societies, violence among adolescent dating partners remains a largely ignored and invisible phenomenon. The goal of this study is to examine the relationships among gender-role beliefs, attitudes justifying dating violence, and the experiences of dating-violence perpetration and victimization among Chinese adolescents. This study has used self-reporting measures to collect data from a probability sample of 976 adolescents (mean age = 15.9) in three Chinese societies: Taiwan, Hong Kong, and Shanghai. Research results reveal a high prevalence of dating violence (including physical violence, sexual violence, and controlling behavior) among Chinese adolescents with dating experience: the perpetration rate is 27.3% and the victimization rate is 39%. Study results demonstrate that adolescents who endorse traditional gender-role beliefs tend to view dating violence as acceptable behavior. Boys' endorsement of traditional gender roles, boys' attitudes justifying boy-on-girl violence, and boys' attitudes against girl-on-boy violence predict boys' actual sexual-violence behavior. Moreover, boys' attitudes justifying boy-on-girl dating violence is the strongest predictor of boys' perpetration of physical and sexual dating violence. This study also shows that boys' hostility is a significant predictor of boys' controlling behavior. Programs for preventing dating violence should include components designed to challenge traditional gender-role beliefs and attitudes justifying dating violence.     

Violence in Juvenile Dating Relationships Self-Reported Prevalence and Attitudes in a Portuguese Sample

The objective of this study was to determine the prevalence of physical and emotional abuse in Portuguese juvenile dating relationships and to investigate attitudes about these forms of violence. A sample of 4,667 participants, aged 13 to 29 years, completed two questionnaires, one behavioral and one attitudinal. At least one act of abuse perpetrated by a dating partner during the previous year was reported by 25.4% of participants (13.4% reported to have been victims of physical abuse and 19.5% of emotional abuse). Abuse of a partner was reported by 30.6% of participants; at least one act of physical abuse was reported by 18.1% and of emotional abuse by 22.4%. The attitudinal data revealed, however, a general disapproval of violence use. Violence support was higher among males, participants with lower educational and social status and those who had never been involved in a dating relationship. Women reported more acts of partner abuse than males; no gender differences were found regarding self-reported victimization. Both perpetration and victimization were reported more by older students. Although university students tend to report more acts of general and emotional abuse against their partners, students from professional schools are more represented among both perpetrators and victims of physical and severe violence. The best predictors of violence were educational status and attitudes toward partner.     

The Impact of Child Abuse History, PTSD Symptoms, and Anger Arousal on Dating Violence Perpetration Among College Women

Preliminary research suggests that child abuse is indirectly associated with female-perpetrated intimate partner violence via posttraumatic stress disorder (PTSD) symptoms and anger. To date, however, no known studies have investigated these relationships for physical and psychological dating violence within a female college sample. Therefore, the purpose of the current study was to examine the impact of child abuse history, PTSD symptoms, and anger arousal on female-perpetrated physical and psychological dating violence. Female undergraduates (N = 496) completed measures of child abuse, PTSD symptoms, anger arousal, and dating violence perpetration as part of a larger trauma and violence study. Results indicated that child abuse directly predicted female-perpetrated physical and psychological dating violence and indirectly impacted female-perpetrated physical and psychological dating violence via PTSD symptoms and anger arousal. The direct relationships between PTSD symptoms and female-perpetrated physical and psychological dating violence were nonsignificant after controlling for the effect of anger arousal.     

Corneal‐Smart Phone: A novel method to intelligently estimate postmortem interval

The changes of postmortem corneal opacity are often used to roughly estimate the postmortem interval (PMI) in forensic practice. The difficulty associated with this time estimate is the lack of objective means to rapidly quantify postmortem corneal changes in crime scenes. This study constructed a data analysis model of PMI estimation and implemented an intelligent analysis system for examining the sequential changes of postmortem corneal digital images, named Corneal‐Smart Phone, which can be used to quickly estimate PMI. The smart phone was used in combination with an attachment device that provided a darkroom environment and a steady light source to capture postmortem corneal images. By segmenting the corneal pupil region images, six color features, Red (R), Green (G), Blue (B), Hue (H), Saturation (S), Brightness (V) and four texture features Contrast (CON), Correlation (COR), Angular Second Moment (ASM), and Homogeneity (HOM), were extracted and correlated with PMI model. The results indicated that CON had the highest correlation with PMI (R² = 0.983). No intra/intersubject variation in CON values were observed (p > 0.05). With the increase in ambient temperature or the decrease in humidity, the CON values were increased. PMI prediction error was <3 h within 36 h postmortem and extended to about 6–8 h after 36 h postmortem. The correct classification rate of the blind test samples was 82%. Our study provides a method that combines postmortem corneal image acquisition and digital image analysis to enable users to quickly obtain PMI estimation.     

The marriage license as a hitting license: A comparison of assaults in dating,cohabiting, and married couples

There are many studies of marital and dating violence. However, methodological differences between these studies make it difficult to determine differences in the nature and extent of physical assault between marital status groups. This paper helps fill that gap by analyzing data from two surveys: a study of 526 dating couples at a large midwestern university, and a study of a national probability sample of 5005 married and 237 cohabiting couples. The results show that cohabiting couples have a higher rate of assault than dating and married couples. These findings persist after controls for age, education, and occupational status are introduced. Violence is also more severe in cohabiting than dating or married couples. A number of factors may account for the more frequent violence in cohabiting relationships. These include social isolation, the issue of autonomy and control, and the investment in the relationship.     

Barriers and Supports to Dating Violence Communication between Latina Adolescents and Their Mothers: A Qualitative Analysis

Few Latinx parents and adolescents talk with one another about dating violence, yet communication with parents could help adolescents make better decisions about dating relationships. Seventeen Latina adolescents (15–17 years old) and their mothers living in Washington D.C and central Virginia participated in semi-structured interviews to explore their perceptions of dating violence behavior and communication with parents about dating violence. Interviews were digitally recorded, transcribed, and coded for emergent themes using a grounded theory approach. Seven themes emerged and were grouped into three domains: (a) Parental Messages about Problems in Dating Relationships; (b) Barriers and Supports for Parent-Adolescent Communication about Dating Problems; and, (c) Cultural Values and Differences. The results of this study can be used to inform future work focused on improving parent-adolescent communication about dating violence and to enhance healthy adolescent Latina dating decisions.     

The effects of academic and interpersonal stress on dating violence among college students: a test of classical strain theory

This study examines Merton's Classical Strain Theory (1938) as a causative factor in intimate partner violence among college students. We theorize that college students experience general life strain and cumulative strain as they pursue the goal of a college degree. We test this strain on the likelihood of using intimate partner violence. Strain due to unrealistic expectations of intimate partnership and economic strain are also examined. The analysis examines the following causative factors representing strain: 1) the College Undergraduate Stress Scale (Renner & Mackin, 1998); 2) cumulative academic strain measured by college classification; 3) cumulative intimate partner strain measured as the length of time in the relationship; 4) academic strain measured by number of hours studied weekly, and 5) economic strain measured by number of hours worked weekly. Additionally, we examine the extent to which gender and race/ethnicity differentially affect intimate partner in the context of these measures of strain. The Conflict Tactics Scales II (Straus et al, 1996) are used to measure dating violence and include indicators for sexual coercion, physical aggression, injury, and psychological aggression. Data were collected from 142 students in lower-division classes from Texas Tech University. Results show that general strain and cumulative intimate partner strain increase the use of dating violence among college students. The longer dating partners are in a relationship, the higher the chances of psychological aggression, physical assault, and sexual coercion. Converse to our expectations, time spent working reduces psychological aggression due to reducing time spent together rather than reflecting economic strain.     

Associations of dating violence victimization with lifetime participation, co-occurrence, and early initiation of risk behaviors among U.S. high school students

This study examined the association of victimization in a physically violent dating relationship with risk behaviors, age of risk behavior initiation, and co-occurrence of risk behaviors among students in grades 9 through 12 in the United States. Data were from the 2003 national Youth Risk Behavior Survey (YRBS). Nearly 9% of students reported experiencing dating violence victimization. Dating violence victimization was associated with alcohol use, marijuana use, and having ever had sexual intercourse among female students and having ever had sexual intercourse among male students. Dating violence victimization also was associated with early initiation of alcohol use among female students. The odds of dating violence victimization increased as the number of risk behaviors increased and as the number of lifetime sexual partners increased. These risk behavior patterns should serve as warning signs of elevated risk for dating violence victimization and may be helpful in identifying adolescents who could benefit from targeted, preventive interventions.     

Dissatisfaction with relationship power and dating violence perpetration by men and women

This study focuses on the relationship between an individual's dissatisfaction with the level of power they have in their dating relationships, parental violence they experienced during their childhoods, and their dating violence perpetration. A sample of 352 male and 296 female undergraduate college students completed a dating violence survey, including selected subscales from the Revised Conflict Tactics Scales (CTS2) and the Relationship Power Scale. Findings show that relationship power dissatisfaction is associated with the use of violence in dating relationships for both men and women. However, parental violence emerged as an even stronger predictor of dating violence perpetration. Findings also indicate that male perpetration of dating violence is related to mother's violence, whereas female perpetration of dating violence is related to father's violence. The results indicate the importance of including gender in the study of dating violence perpetration.     

Quantification of Pubic Symphysis Metamorphosis Based on the Analysis of Clinical MDCT Scans in a Contemporary Malaysian Population

Forensic age estimation methods are biased to sex and population; in general, accuracy is reduced when applied to foreign populations. This study assessed the accuracy of the Suchey–Brooks method in contemporary Malaysian individuals and aimed to formulate population‐specific standards. Multi‐detector computed tomography scans of 355 individuals (165 male; 190 female) of 15–83 years of age were reconstructed using 3D‐volumetric rendering in RadiAnt. Pubic symphyseal phase, bias, inaccuracy, and percentage correct age classifications are examined. Transition analysis was used to develop age estimation standards. High observer agreement (κ = 0.763–0.832) and a positive relationship between age and pubic symphyseal phase (r = 0.884–0.90) were demonstrated. Mean inaccuracies were 8.62 and 8.95 years for males and females, respectively; overall correct classification was 97.8%. Transition ages between phases in males were 18.79, 23.29, 28.85, 43.64, and 61.15 years; in females, the corresponding data were 19.77, 22.53, 32.62, 41.85, and 57.39 years.     

Ancestry Estimation Using Cranial and Postcranial Macromorphoscopic Traits

Ancestry estimation methods using macromorphoscopic (MMS) traits commonly focus exclusively on cranial morphology. The objective of this study was to demonstrate the value of postcranial MMS traits, highlighting a combined cranial/postcranial trait approach to ancestry estimation using quadratic discriminant function and a variety of machine learning classification models including artificial neural networks (aNN), random forest models, and support vector machine. Eight cranial and eleven postcranial MMS traits were collected from the Terry and Bass Skeletal Collections (American Black = 81; American White = 173). Our classification models using cranial and postcranial traits correctly classified 88–92% of the sample, improving classification accuracies by nearly fifteen percent over models relying exclusively on cranial data. These same results demonstrate the importance of a multivariate statistical framework incorporating cranial and postcranial data and the nearly unlimited potential of machine learning models to improve the accuracy of ancestry estimates over traditional methods of analysis. To facilitate implementation in casework, one of the more robust models (aNN) is incorporated into a web-based application, ComboMaMD Analytical, to facilitate cranial and postcranial MMS traits analysis for ancestry estimation.