Errors in the estimation of the distance of fall and angles of impact blood drops.

This paper presents derived equations for the estimation of the variances in the estimated distance of fall and the estimated angle of impact for blood droplets. The derived equation for the variance of the estimated distance of fall predicts that as the blood drop size approaches that of a blood droplet falling at terminal velocity, the variance of the estimate grows without limit. The derived equation for the variance in the estimated angle of impact shows that as the angle of impact approaches 90 degrees, the variance grows without limit. The validity of the equation for the estimated variance of the angle of impact was tested for five angles of impact (15, 30, 45, 60 and 75 degrees); the equation correctly predicted the observed variance up to an angle of 60 degrees.     

From the Instrument of Delivery to the Actual Agent of Harm: Fighting the Criminal Purchase of Ammunition

The illegal trade in ammunition in the Netherlands seems to be a small-scale problem. However, as a result of high profits and a small chance of being caught, it is an extremely attractive criminal activity for malicious individuals. The criminal purchase of ammunition is facilitated by weaknesses in the logistic supply chain for legal ammunition, current legislation on the purchase, possession, transport and use of ammunition and the inadequacy with which Dutch government agencies enforce the laws. The fight against the criminal purchase of ammunition could benefit from the adoption of an automated registration system by arms dealers, the use of a different type of freighting method for legal ammunition transport and a common approach by European law enforcement agencies.     

Who is most at risk for intimate partner violence? A Canadian population-based study

Whole population studies on intimate partner violence (IPV) have given contradictory information about prevalence and risk factors, especially concerning gender. The authors examined the 1999 Canadian General Social Survey data for gender patterns of physical, sexual, emotional, or financial IPV from a current or ex-partner. More women (8.6%) than men (7.0%, p = .001) reported partner physical abuse in general, physical IPV causing physical injury (p < .0001), sexual abuse (1.7% vs. 0.2%, p < .0001), and financial abuse (4.1% vs. 1.6%, p < .0001). There were no gender differences for partner emotional abuse. Significant risk factors after multivariate modeling for physical/sexual IPV were younger age, being divorced/separated or single, having children in the household, and poor self-rated physical health. These findings from a large, randomly generated data set further refine our understanding of the risk profile for IPV in the developed world.     

Kids are Different: The United States Supreme Court Reforms Youth Sentencing Practices for Youth Prosecuted in the Criminal Justice System

In a series of decisions issued between 2005‐2016, the United States Supreme Court relied on emerging scientific research detailing the developmental differences between children and adults to revamp its juvenile sentencing jurisprudence under the Eighth Amendment. The research established that youth’s developmental immaturity reduces their culpability for their criminal conduct, while also demonstrating their heightened capacity for change and rehabilitation. The Court focused on the most extreme sentences for youth, banning the imposition of the death penalty on youth under the age of eighteen in Roper v. Simmons (2005), and severely limiting the availability of life without parole sentences even for youth convicted of murder, in Graham v Florida (2010) and Miller v Alabama (2012). This article traces the Court’s evolution in reviewing sentences for youth in our justice system, and considers how the Court’s reasoning in these cases may influence further reforms in the justice system’s treatment of youth looking ahead.     

INDIVIDUAL AND COPARENTING DIFFERENCES BETWEEN DIVORCING AND UNMARRIED FATHERS

The current study examines differences in demographic characteristics, parental conflict, and nonresidential father involvement between divorcing and unmarried fathers with young children. Participants were 161 families (36 unmarried) with children aged 0 to 6 years, involved in a larger longitudinal study of separating and divorcing families. Baseline data were gathered from parenting plans, court databases, and parent reports. Results indicated that unmarried fathers were younger, more economically disadvantaged, less well educated, less likely to have their children living with them, and had less influence on decision making. Unmarried fathers reported more conflict regarding their attempts to be involved with their children in their day-to-day activities. Understanding these unique characteristics and dynamics will help to maximize effective services in the legal system for unmarried couples.     

Disputes and conflicts inside organizations: A systems approach

Book reviewed in this article: Robert R. Blake and Jane Srygley Mouton , Solving Costly Organizational Conflicts David Ewing , Justice on the Job William L. Ury, Jeanne M. Brett , and Stephen B. Goldberg , Getting Disputes Resolved: Designing Systems to Cut the Costs of Conflict Alan F. Westin and Alfred G. Feliu , Resolving Employment Disputes Without Litigation James T. Ziegenfuss , Organizational Troubleshooters: Resolving Problems with Customers and Employees     

Differentiation of fetal and adult bloodstains by pyrolysis-gas-liquid chromatography

A pyrolysis-gas-liquid chromatographic method has been developed for the differentiation of adult and fetal bloodstains. In a blind-coded study, five adult and three fetal bloodstains were correctly identified on the basis of the pyrograms of stain extracts. The differentiation between adult and fetal bloodstains is based on the peak height ratio of two long-retention-time peaks appearing in their pyrograms. The first of these peaks has been tentatively identified as indole derived from the pyrolysis of tryptophan, while the second peak is an as-yet unidentified molecular fragment produced by the pyrolysis of some component of the hemoglobin molecule other than the amino acids tryptophan, tyrosine, and phenylalanine.     

Errors in the determination of the point of origin of bloodstains

Bloodstain pattern analysts are sometimes called upon to determine the point of origin of a pattern of bloodstains. A derivation of expressions for the uncertainties deltaX and deltaY in the coordinates of the point of origin P(X, Y) of two bloodstains on a surface has recently been published. These uncertainties were expressed in terms of the uncertainties in the measured distance between the bloodstains and the uncertainties in the angles of impact of the bloodstains. This paper extends the derivations in the previous work by expressing the uncertainties in the coordinates of the point of origin of two bloodstains in terms of the uncertainties in the length and width measurements from which the angles of impact of the bloodstains are calculated.