Voltammetric analysis of luminescent markers in gunshot residues

Currently, SEM-EDS is used to detect gunshot residue (GSR) from the presence of Ba, Pb, and Sb in the sample. However, the development of new nontoxic ammunition (NTA) has prevented conventional metals from being found. In this work, we aim to determine the presence of an inorganic luminescent chemical marker based on rare earth in gunshot residues using the technique of squarewave voltammetry (SWV). After firing, the luminescent complex [(Eu₂Zr)(btc)₃(Hbtc)_0.5.6H₂O], which is used as a chemical marker, can be detected under a UV lamp. An aqueous solution with 0.1 mol L⁻¹ KCl as supporting electrolyte can be easily collected on carbon paste electrode surfaces for SWV analysis A = 100 mV, f = 10 Hz, and step potential of 5 mV are required. The luminescent marker incorporated into the carbon paste electrode showed two anodic peak currents in the region of 0.4 V (vs Ag/AgCl) and at 0.75 V (vs Ag/AgCl) and also a cathodic one in 0.4 V (vs Ag/AgCl). SEM-EDS was able to analyze the same voltammetric results for conventional and nontoxic ammunition containing the luminescent marker. Therefore, voltammetry and SEM-EDS are valid for detecting the new residue marker in GSR. Despite this, the electrochemical method is still more advantageous because of its low cost and lack of expensive equipment and supplies in forensic laboratories.     

Negotiating power and authority in the desert: the Arab Bedouin and the limits of the Ottoman state in Hijaz, 1840–1908

This article explores the techniques and strategies used by Ottoman authorities to control the Bedouin with a specific focus on the province of Hijaz between 1840 and 1908. Using primary sources from the Ottoman and British archives, it argues that the Ottoman Empire developed a ‘politics of negotiation’ towards the tribes in its attempt to secure cities and major pilgrimage and trade routes against tribal attack. The principal agents of the empire who made this negotiated governance possible were the amir of Mecca and the governor of Hijaz. As a result of this policy, imperial authorities had to give significant concessions to the tribes, and they thus incorporated them into the province's imperial order. When the Ottoman economy went through a crisis, as in the 1900s, negotiated governance and order faced great problems.     

Bidimensional Data Allow for Better Age Estimation on Immature Specimens than Unidimensional Data: A Preliminary Study on the Ilium

Most biometric age estimation methods used in anthropological and forensic science for juveniles are based on unidimensional measurements (length or width). Here, a new method using bidimensional data was tested. A 3D morphometric analysis was performed on 108 CT scans of ilium bone of juveniles (from 20 gestational weeks to 12 years old). The sample was divided into training and validation groups. Best predictors were determined by comparing the efficiency of each variable (length, width, area, and module: a product of length and width). We established linear and polynomial regressions for each parameter for both sides. Applying the equations to the validation sample showed no significant difference between real and predicted ages. For age estimation, the area and module parameters yielded better results than unidimensional measurements. The results from this preliminary study were highly conclusive, and it would be interesting to extend the work, covering larger samples, and other bones.     

Adaptation of the Narcissistic Personality Inventory among a Portuguese sample of incarcerated juvenile offenders

The aim of the present study was to assess the psychometric properties of the Narcissistic Personality Inventory (NPI) and two of its short forms (NPI-16 and NPI-13) among a Portuguese sample of male incarcerated juvenile offenders (N?=?221). Of these, only the NPI-13 short version demonstrated a good fit in terms of its factor structure. The NPI-13 also showed promising psychometric properties in terms of its internal consistency, convergent validity, discriminant validity, and criterion-related validity. Statistically significant associations were found with age of crime onset, crime seriousness, conduct disorder symptoms, alcohol abuse, and cannabis use. These findings justify the use of the NPI-13, especially its Entitlement/Exploitativeness dimension, among incarcerated male youths.     

Fatal intoxication with tianeptine (Stablon)

Tianeptine (Stablon), although structurally similar to tricyclic antidepressants, acts by enhancing the reuptake of serotonin. A fatal case is presented involving a 26-year-old man, found lying in bed with a "mushroom of foam" around his mouth. Empty blister packs of Stablon and a suicide note were found next to the body. A liquid-liquid extraction procedure with n-hexane: ethyl acetate and n-hexane: 2-propanol, followed by LC-DAD-MS analysis, using positive mode electrospray ionization was performed. The detection limit was 0.001 microg/mL. The toxicological results revealed the following tianeptine concentrations in the post-mortem samples: blood 5.1 microg/mL; urine 2.0 microg/mL; liver 23 microg/g; stomach contents 22 mg. Femoral blood analyses also revealed an ethanol concentration of 0.53 g/L. The present method was also developed and validated for the other post-mortem specimens, since no previous published data had confirmed the post-mortem distribution of tianeptine. The absence of other suitable direct causes of death (macroscopic or histological) and the positive results achieved with the toxicological analysis led the pathologist to rule that death was due to an intoxication caused by the suicidal ingestion of tianeptine in combination with alcohol.     

House arrest with electronic monitoring: the Rio de Janeiro experience

This article outlines the House Curfew with Electronic Monitoring (HCEM) experience in Rio de Janeiro (Brazil). Recently implemented in this Brazilian jurisdiction, HCEM has already achieved positive outcomes in terms of post-trial de-incarceration, as it reduced the open prison population by 35% from 2009 to 2014. In addition to describing and critically discussing these changes in the Rio de Janeiro criminal justice system, the study also reports offenders’ perceptions regarding this new crime control method in Rio de Janeiro. This perspective provides interesting feedback regarding HCEM in terms of safety, its punitive character, technological problems, constraints, and stigmatisation.     

Human trafficking and criminal proceedings in Portugal: discourses of professionals in the justice system

Since the adoption of the UN Trafficking Protocol in 2000, the predominant approach to combat human trafficking has been based on the criminalization of traffickers in conjunction with a concern for victims’ protection. However, few empirical studies considered the effectiveness of those measures, which makes it difficult to understand why criminal cases of human trafficking generally result in few convictions. In Portugal, recent legislative changes have made the legal framework on human trafficking more comprehensive, inclusive and convergent with European directives. The effects of the implementation of those legislative changes on investigation and prosecution are still overlooked. The present study analyses the discourses of justice system professionals that concern the investigation and prosecution of human trafficking. It examines and identifies the factors that, in their perspective, block the recognition of the typifying elements of the crime of human trafficking and create obstacles to the prosecution and conviction of those crimes. Our findings suggest that legislative advances recognized by the participants need to be accompanied by other changes, some of a more systemic nature and others that are more specific. An efficient criminal procedure should include better legal phrasing of the means of evidence of human trafficking that is supported by objective instruments for this to be considered valid; the centralization of proof that the testimony of the victim has to overcome; specialized professional training of an ongoing nature; an efficient cooperation between the various law enforcement agencies at the national and international levels, with public prosecution services and magistrates; a greater clarification of the condition of the special vulnerability of victims and an informed perspective regarding the global nature of the phenomenon of human trafficking, one that is also sensitive towards the victim (e.g., in relation to the victims’ vulnerability, illegal status, and their difficulties in terms of social and cultural integration).