Evaluation of the Simultaneous Analysis of Organic and Inorganic Gunshot Residues Within a Large Population Data Set Using Electrochemical Sensors*,†

The increasing demand for rapid methods to identify both inorganic and organic gunshot residues (IGSR and OGSR) makes electrochemical methods, an attractive screening tool to modernize current practice. Our research group has previously demonstrated that electrochemical screening of GSR samples delivers a simple, inexpensive, and sensitive analytical solution that is capable of detecting IGSR and OGSR in less than 10 min per sample. In this study, we expand our previous work by increasing the number of GSR markers and applying machine learning classifiers to the interpretation of a larger population data set. Utilizing bare screen-printed carbon electrodes, the detection and resolution of seven markers (IGSR; lead, antimony, and copper, and OGSR; nitroglycerin, 2,4-dinitrotoluene, diphenylamine, and ethyl centralite) was achieved with limits of detection (LODs) below 1 µg/mL. A large population data set was obtained from 395 authentic shooter samples and 350 background samples. Various statistical methods and machine learning algorithms, including critical thresholds (CT), naïve Bayes (NB), logistic regression (LR), and neural networks (NN), were utilized to calculate the performance and error rates. Neural networks proved to be the best predictor when assessing the dichotomous question of detection of GSR on the hands of shooter versus nonshooter groups. Accuracies for the studied population were 81.8 % (CT), 88.1% (NB), 94.7% (LR), and 95.4% (NN), respectively. The ability to detect both IGSR and OGSR simultaneously provides a selective testing platform for gunshot residues that can provide a powerful field-testing technique and assist with decisions in case management.     

Jurilinguistics: Ways Forward Beyond Law,Translation, and Discourse

International Journal for the Semiotics of Law - Revue internationale de Sémiotique juridique - This is the guest editors’ introductory paper to the special issue “Situating...     

Decentralization and citizen trust: An empirical study of policing in more and less developed countries

Decentralization is argued to enhance citizen–government relationships and, thus, to lead to higher levels of citizen trust. General purpose policing encompasses various services that might be assigned to different levels of governments. The literature lacks generalizable studies of the effects of the structural arrangements of police systems on police performance. This study is a cross‐national exploration of the relationship between the varying degrees of police decentralization and police performance as measured by citizen trust in the police. It uses a measure of decentralization of police systems based on the tiers of government with some control over police. Results show that, in the 72 sample countries, the relationship between citizen trust in police and decentralized police systems is not statistically significant. However, when the countries are categorized by the Human Development Index, decentralized police systems tend to be positively related to citizen trust in the more developed countries but inversely in the less developed countries.     

Transnationalization,Social Integration,and Capitalist Diversity in the East and the South

This article analyzes the deep and shallow modes of international integration, semicore, semiperipheral, and peripheral profiles of global insertion, and the presence and absence of transformative state capacity and social cohesion, as interacting dimensions of capitalist diversity in post-socialist Eastern Europe and Latin America. On these grounds, it is argued that Cardoso and Faletto’s dependent development paradigm maintains validity. When adapted to the new conditions, their approach is able to capture the overlapping and divergent aspects of capitalist development in both regions. Recent patterns of development demonstrate that although dependency, stemming from the unequal distribution of resources, roles, and opportunities, continues to be an important aspect of the international division of labor, it ceases to contradict even complex forms of industrialization. Similarly, notwithstanding the asymmetrical power relationships characterizing them, the new transnational integration regimes allow and sometimes help formation of new nation states with improved regulatory capacities. Finally, dependency does not necessarily undermine domestic social inclusion. Rather, it is up to the democratic competition to strike a balance between the requirements of promising international and socially acceptable domestic integration.     

Optimal central banker contracts and common agency: a comment

We explore a setting where the central bank is offered an incentive scheme by an interest group, in addition to the contract designed by the government. We prove that the inflation bias can be eliminated when principals do not cooperate and have different output or inflation objectives. These conclusions contrast with those of Chortareas and Miller (Public Choice 121:131–155, 2004). The reason is that our analysis takes into account the participation constraints of the central bank. We also show that, if principals cooperate, the inflation bias is eliminated when their output target is different but not when they disagree over the inflation objective.     

Reinforcement vs. change: The political influence of the media

The aim of this paper is to analyze competition between two ideological media outlets that want to influence their viewers so as to boot the number of votes for their preferred political party. We consider two ways of influencing viewers, which correspond to two prominent theories borrowed from the literature on Sociology: the “Reinforcement Approach” and the “Attitudinal Orientations Approach”. Our findings show that the aim of influencing viewers generally pushes media outlets to differentiate their opinions, and that the extend of this differentiation deeply depends on the viewers’ behavior. More precisely, we observe that if the viewers channel hop, media outlets end up differentiating their opinions more than if the viewers receive all their information from just one media.     

Cocaine in Wayne County Medical Examiner's cases

We determined the incidence of detection of cocaine or its metabolites in Wayne County (Michigan) Medical Examiner's cases from 1984 to 1987. Over this four-year period there was a significant (P less than 0.01) increase each year in evidence of recent cocaine use in this population, reaching 38.3% of all tested cases in 1987. Much of this increase was accounted for by homicide victims, especially those in their third or fourth decade of life, of whom 58.6 and 56.3%, respectively, tested positive in 1987. There was a large increase in recent cocaine use in teenage homicide victims in 1987, having previously changed little from 1984 to 1986. In victims of drug abuse, recent cocaine use also increased significantly (p less than 0.01) each year, reaching 47.6% in 1987, generally in combination with heroin. Although deaths attributed solely to cocaine were not as common, they also increased significantly each year from 4 in 1984 to 25 in 1987. Compared with the general population, those who use cocaine in Wayne County are more likely than those who do not to die prematurely, often as a result of violence.     

Economic policy elites and democratization

Is the authoritarian potential of policy elites a mortal threat to the consolidation of democracy in Latin America? This article suggests that in the context of democratic transitions, significant variations may exist in the performance of technocratic roles. In most countries in the region, elected governments faced the crisis of the 1980s by retaining markedly technocratic and exclusionary styles of policy-making. In Chile, a highly technocratic form of authoritarianism was succeeded by a novel pattern of pragmatic cooperation between technical and political elites. Democratic institutions were reestablished while a strong economic team enforced coherence and continuity in economic policy. Historical and institutional factors are used to show that Chile may now be nearer the democratic pole than other “hybrid” democratic-authoritarian regimes in the region.     

Monoclonal antibodies with anti-N specificity

In this article serologic characteristics of monoclonal antibodies with anti-N specificity is given. Antibodies are directed to homologous sequence of N-form of A glycophorine (group-specific N-antigen) and B glycophorine, expressed both on N- and on M-erythrocytes. Higher titre and avidity of monoclonal antibodies with anti-N specificity in relation to erythrocytes with N-phenotype make it possible to detect N-antigen in material subjected to expert evaluation.