Validation of tool mark analysis of cut costal cartilage

This study was designed to establish the potential error rate associated with the generally accepted method of tool mark analysis of cut marks in costal cartilage. Three knives with different blade types were used to make experimental cut marks in costal cartilage of pigs. Each cut surface was cast, and each cast was examined by three analysts working independently. The presence of striations, regularity of striations, and presence of a primary and secondary striation pattern were recorded for each cast. The distance between each striation was measured. The results showed that striations were not consistently impressed on the cut surface by the blade's cutting edge. Also, blade type classification by the presence or absence of striations led to a 65% misclassification rate. Use of the classification tree and cross-validation methods and inclusion of the mean interstriation distance decreased the error rate to c. 50%.     

A Cross-cultural Validation of the Brief Child Abuse Potential Inventory (BCAP)

The aim of this study was to provide preliminary findings on the cross-cultural validation and reliability of the Brief Child Abuse Potential Inventory (BCAP) developed by Ondersma et al. (Journal of Clinical Child and Adolescent Psychology, 2005). A community sample of 324 parents was recruited through schools from a range of socioeconomic areas in a large UK city. The BCAP appears to be a reliable instrument that is easy to use and shows promise as a brief screening tool for parental child abuse potential within the UK. Modifications are suggested to the validity scales and the conceptual structure based on this sample, however, detailed testing of the utility of this scale for clinical practice outside the US should be pursued.     

Expertise in Fingerprint Identification

Although fingerprint experts have presented evidence in criminal courts for more than a century, there have been few scientific investigations of the human capacity to discriminate these patterns. A recent latent print matching experiment shows that qualified, court‐practicing fingerprint experts are exceedingly accurate (and more conservative) compared with novices, but they do make errors. Here, a rationale for the design of this experiment is provided. We argue that fidelity, generalizability, and control must be balanced to answer important research questions; that the proficiency and competence of fingerprint examiners are best determined when experiments include highly similar print pairs, in a signal detection paradigm, where the ground truth is known; and that inferring from this experiment the statement “The error rate of fingerprint identification is 0.68%” would be unjustified. In closing, the ramifications of these findings for the future psychological study of forensic expertise and the implications for expert testimony and public policy are considered.     

Anonymous Speakers and Confidential Sources: Using Shield Laws When They Overlap Online

The development of the Internet as a mass medium has created new tensions between the rights to speak anonymously and to be protected against defamation. Some courts have developed balancing tests to determine when anonymous speakers should be unmasked, the most popular of which generally require some initial showing of prima facie evidence. Other times, shield laws have been used to protect the anonymous when comments have been posted on news organization Web sites. However, news organizations should be cautious when using shield laws to protect anonymity, and judges should evaluate privilege claims as they always have. In other instances, anonymity appears to be adequately protected by summary judgment balancing tests. An approach in which news organizations focus on the type of comment and its potential journalistic contribution in deciding how to protect commenters’ identities could help ensure that anonymous speech is properly protected without harming shield laws.     

Governance as a strategy in state-of-nature games

Public choice scholars routinely claim that coercion can be used to solve the social dilemma. However, while social contract theorists have frequently described state-of-nature societies using game theory, they have not used game theory to show how coercive action within such societies can improve outcomes. Here I operationalize the concepts of coercion and governance within a Prisoners’ Dilemma (PD) framework; governance is operationalized as coercion to compliance, and to adopt a coercive strategy is to impose a strategy choice upon another player. I show that, under certain conditions, adding governance strategies to a noncoercive one-shot PD game can improve outcomes.