The use of linear dichroism in forensic fibre examinations — Part 6. Validation and practical aspects of MSP-PPL

This paper summarizes the results of previous work on the microscopic observation of linear dichroism found in dyed fibres (polyesters, polyamides, wool, silk, cotton, viscose, acrylics and acetates) and in pigmented fibres as well as the measurements on these fibre classes using microspectrophotometry with plane polarized light (MSP-PPL). The validation of this method is discussed and a practical tool is proposed for comparing fibre traces with control fibres. The limitations and strengths of this method are also revised.     

Proportionality and Self-Defense

Proportionality is widely accepted as a necessary condition of justified self-defense. What gives rise to this particular condition and what role it plays in the justification of self-defense seldom receive focused critical attention. In this paper I address the standard of proportionality applicable to personal self-defense and the role that proportionality plays in justifying the use of harmful force in self-defense. I argue against an equivalent harm view of proportionality in self-defense, and in favor of a standard of proportionality in self-defense that requires comparable seriousness and takes into account the wrong, as opposed simply to the harm that the victim is fending off. I distinguish the standard of proportionality in self-defense from proportionality in circumstances of necessity, and I discuss whether proportionality is an internal or an external constraint on the right of self-defense.     

The Relationship Between School Engagement and Delinquency in Late Childhood and Early Adolescence

Engagement in school is crucial for academic success and school completion. Surprisingly little research has focused on the relationship between student engagement and delinquency. This study examines whether engagement predicts subsequent school and general misconduct among 4,890 inner-city Chicago elementary school students (mean age: 11 years and 4 months; 43.3% boys; 66.5% black; 28.8% Latino). To improve upon prior research in this area, we distinguish three types of engagement (emotional, behavioral, and cognitive), examine whether the relationship between engagement and misconduct is bidirectional (misconduct also impairs engagement), and control for possible common causes of low engagement and misconduct, including peer and family relationships and relatively stable indicators of risk-proneness. Emotional and behavioral engagement predict decreases in school and general delinquency. However, cognitive engagement is associated with increases in these outcomes. School and general delinquency predict decreased engagement only in the cognitive domain. Suggestions for future research and implications for policy are discussed.