Raman spectroscopy and microspectrophotometry of reactive dyes on cotton fibres: Analysis and detection limits

A collaborative study on Raman spectroscopy and microspectrophotometry (MSP) was carried out by members of the ENFSI (European Network of Forensic Science Institutes) European Fibres Group (EFG) on different dyed cotton fabrics. The detection limits of the two methods were tested on two cotton sets with a dye concentration ranging from 0.5 to 0.005% (w/w). This survey shows that it is possible to detect the presence of dye in fibres with concentrations below that detectable by the traditional methods of light microscopy and microspectrophotometry (MSP). The MSP detection limit for the dyes used in this study was found to be a concentration of 0.5% (w/w). At this concentration, the fibres appear colourless with light microscopy. Raman spectroscopy clearly shows a higher potential to detect concentrations of dyes as low as 0.05% for the yellow dye RY145 and 0.005% for the blue dye RB221. This detection limit was found to depend both on the chemical composition of the dye itself and on the analytical conditions, particularly the laser wavelength. Furthermore, analysis of binary mixtures of dyes showed that while the minor dye was detected at 1.5% (w/w) (30% of the total dye concentration) using microspectrophotometry, it was detected at a level as low as 0.05% (w/w) (10% of the total dye concentration) using Raman spectroscopy. This work also highlights the importance of a flexible Raman instrument equipped with several lasers at different wavelengths for the analysis of dyed fibres. The operator and the set up of the analytical conditions are also of prime importance in order to obtain high quality spectra. Changing the laser wavelength is important to detect different dyes in a mixture.     

Victims' influence on intimate partner violence revictimization: an empirical test of dynamic victim-related risk factors

Research has reported that not only characteristics of the perpetrator but also characteristics of the victim influence risk for intimate partner violence (IPV). This would suggest that prevention of repeat abuse could benefit from a focus on both perpetrator and victim characteristics. Knowledge on factors that are within victims' sphere of influence is important because a focus on victim characteristics can help victims to take control of their situations and can thereby empower them. Dynamic victim-related factors are most relevant here as these are factors that can be changed or improved, in contrast to unchangeable static factors. Surprisingly, however, little is known about how victim-related factors affect risk for revictimization of IPV. The current study was conducted among a Dutch sample of 156 female, help-seeking IPV victims. The aim was to examine to what extent prior IPV and, in particular, dynamic victim-related factors influence risk for future IPV. In accordance with the models articulated by Foa, Cascardi, Zoellner and Feeny, we studied how the three key factors from their models-partner violence, victims' psychological difficulties, and victims' resilience-related to risk for IPV revictimization. Results provide support for several key factors (partner violence and victims' psychological difficulties) and, moreover, show which victim-related factors contribute to revictimization risk above and beyond the influence of prior violence committed by a partner against the victim (i.e., victims' prior IPV victimizations). Findings are discussed in terms of recommendations for practice and future research.     

Beyond town and gown: university economic engagement and the legacy of the urban crisis

University-driven land development and research into the amelioration of social problems are examples of the wider dimensions of economic engagement by large American research universities in metropolitan settings since 1949, and both dimensions are strongly conditioned by the experiences of universities and surrounding neighborhoods during the “urban crisis” of the 1960s. The rise of the modern American research university between 1950 and 1980 coincided with the economic decline of large American cities and the slide of their poorest neighborhoods into severe socioeconomic distress. The elite identification of the university as a force for economic and social change was a direct response to these urban upheavals, and the dynamics of its new role were fueled by the presumptions of postwar consensus liberalism. The urban crisis had an effect on town-gown relations that endured into the early twenty-first century, not least because it made local governments and universities allies rather than adversaries. Countering definitions of the role the university should take in economic development have arisen from a “town” comprised not of elected officials, but of community members from both within and outside of the university. The long shadow of urban crisis attests to the historical contingency of town-gown interactions and the usefulness of historical, case-based approaches to understanding the role of universities in urban and metropolitan economies.     

Retributivism and Legal Moralism

This article examines whether a retributivist conception of punishment implies legal moralism and asks what liberalism implies about retributivism and moralism. It makes a case for accepting the weak retributivist thesis that culpable wrongdoing creates a pro tanto case for blame and punishment and the weak moralist claim that moral wrongdoing creates a pro tanto case for legal regulation. This weak moralist claim is compatible with the liberal claim that the legal enforcement of morality is rarely all‐thing‐considered desirable. Though weak moralism has some plausibility, it does not follow from weak retributivism if legitimate state functions are limited in certain ways.     

Researching counterterrorism: a critical perspective from the field in the light of allegations and findings of covert activities by undercover police officers

The article addresses some of the key issues that are raised for researchers engaging with counterterrorism police officers and initiatives, when undertaking research. A significant area to explore in this context is, in fact, the issue of relationships with counterterrorism police officers who may themselves directly have been covert police officers in the past and/or who may be continuing in their current, apparently more open, role (wittingly or otherwise) as agents of broader state strategies of exploiting trust for intelligence-gathering purposes. This article suggests that it is important for researchers to understand that working within the counterterrorism field involves degrees and shades of risk in the service of trust-building, sensitivity and the empowerment of communities, and that researchers themselves can (wittingly and unwittingly) be part of wider strategies instigated by security-minded individuals or groups of counterterrorism police officers. Reflecting upon the research that we have undertaken individually and collectively over the last number of years, in the light of the most recent spate of allegations about counterterrorism police officers infiltrating activist and political protest groups, having sexual relationships, and indeed, on occasion, children, with women whilst undercover and of potentially working to entrap vulnerable individuals into planning terrorist acts, this article raises questions around trust, credibility, legitimacy, the prevalence and near unavoidability of dysfunctional agendas and the implications of all of the above for community-based approaches to counterterrorism.     

Determining the Refractive Index Variation within Panes of Vehicle Windshield Glass

Refractive indices of seven double‐paned vehicle windshields were measured to assess the variation across the pane of glass and to evaluate collection techniques for known glass standards by comparing false negative rates. Measurements were made using a Foster and Freeman GRIM3 instrument, and a minimum of 240 measurements were made per pane. The mean SD of the windshields was 0.00004. It was further determined that collecting a known sample from two different sections of a shattered windshield gave the lowest rate of false negatives when using ± 2 standard deviations to estimate the RI variation of the known glass. Additionally, refractive indices often were highest in the center of the windshield and decreased toward the left and right edges; in approximately half the sample set, the two panes of a single windshield were differentiated by one or more properties.     

Internal Validation of Human Mitochondrial DNA Quantification Using Real‐Time PCR

The quantity of mitochondrial DNA (mtDNA) template added for amplification and subsequent dye terminator reactions is critical for obtaining quality sequence data. Validation of a human mtDNA real‐time quantitative PCR (qPCR) assay demonstrated its high degree of reproducibility and precision as well as an extremely sensitive threshold of detection (0.0001 pg/μL or approximately six human mtDNA copies/μL). A study of 35 nonprobative bone and teeth evidence samples revealed that 20 pg of mtDNA template is recommended for successful HV1 and HV2 sequence analysis; however, as little as 0.013 pg can generate a full mtDNA profile when using enhanced amplification reactions. The assay can also detect PCR inhibition and is useful for identifying samples that may benefit from re‐purification. Overall, the assay is an excellent method to quantify mtDNA and is useful for determining the best analytical approach for successful sequencing.     

Driving Under the Influence of Synthetic Cannabinoid Receptor Agonist XLR‐11

The case of a 22‐year‐old male Caucasian driver is presented. He was involved in a traffic collision. At the roadside, he displayed blank stare and mellow speech with a barely audible voice. A DRE found low body temperature, rigid muscle tone, normal pulse, lack of horizontal and vertical gaze nystagmus, nonconvergence of the eyes, dilated pupil size, and normal Pupillary reaction to light. A standard toxicology DUID protocol was performed on the driver's whole blood including ELISA and GC‐MS drug screens with negative results. Additional drug screening was undertaken for bath salts and synthetic cannabinoid receptor agonists by LC‐MS/MS by a commercial laboratory and identified the synthetic cannabinoid receptor agonist XLR‐11 in the driver's blood. XLR‐11 was subsequently quantified at 1.34 ng/mL. This is the first documented case involving a driver operating a motor vehicle under the influence of the synthetic cannabinoid receptor agonist XLR‐11.     

The Influence of Congressional Preferences on Legislative Overrides of Supreme Court Decisions

Studies of Court–Congress relations assume that Congress overrides Court decisions based on legislative preferences, but no empirical evidence supports this claim. Our first goal is to show that Congress is more likely to pass override legislation the further ideologically removed a decision is from pivotal legislative actors. Second, we seek to determine whether Congress rationally anticipates Court rejection of override legislation, avoiding legislation when the current Court is likely to strike it down. Third, most studies argue that Congress only overrides statutory decisions. We contend that Congress has an incentive to override all Court decisions with which it disagrees, regardless of their legal basis. Using data on congressional overrides of Supreme Court decisions between 1946 and 1990, we show that Congress overrides Court decisions with which it ideologically disagrees, is not less likely to override when it anticipates that the Court will reject override legislation, and acts on preferences regardless of the legal basis of a decision. We therefore empirically substantiate a core part of separation‐of‐powers models of Court–Congress relations, as well as speak to the relative power of Congress and the Court on the ultimate content of policy.