Hierarchical,Three‐Dimensional Measurement System for Crime Scene Scanning

We present a new generation of three‐dimensional (3D) measuring systems, developed for the process of crime scene documentation. This measuring system facilitates the preparation of more insightful, complete, and objective documentation for crime scenes. Our system reflects the actual requirements for hierarchical documentation, and it consists of three independent 3D scanners: a laser scanner for overall measurements, a situational structured light scanner for more minute measurements, and a detailed structured light scanner for the most detailed parts of tscene. Each scanner has its own spatial resolution, of 2.0, 0.3, and 0.05 mm, respectively. The results of interviews we have conducted with technicians indicate that our developed 3D measuring system has significant potential to become a useful tool for forensic technicians. To ensure the maximum compatibility of our measuring system with the standards that regulate the documentation process, we have also performed a metrological validation and designated the maximum permissible length measurement error E_MPE for each structured light scanner. In this study, we present additional results regarding documentation processes conducted during crime scene inspections and a training session.     

Can financial incentives reduce juvenile confinement levels? An evaluation of the Redeploy Illinois program

Purpose

Assessments of ongoing fiscal restructuring of juvenile justice system processes and the impact such restructuring has on juvenile incarceration rates are limited. When impacts of fiscal restructuring efforts have been assessed, researchers have focused on systemic, macro level changes in incarceration rates but avoided more focused, micro level impacts. This study fills this knowledge gap by examining the recent implementation of the Redeploy Illinois program in two pilot sites. In the Redeploy Illinois program, financial incentives were provided to select counties to develop community based alternatives to incarceration. The goal was to alleviate over reliance on state funded residential facilities for evaluation and confinement purposes.

Methods

Agency data were analyzed using qualitative methods to examine the effects of this change.

Results

Results of this study demonstrated that counties participating in the pilot test of the Redeploy Illinois program were able to reduce their levels of juvenile commitment to the state. Peoria County exceeded their reduction benchmark for all but two years, and St. Clair County well exceed their reduction benchmark for all full calendar years subsequent to implementation.

Conclusions

Findings are consistent with the limited literature exploring fiscal restructuring efforts designed to reduce county levels juvenile commitments.     

Accuracy and Repeatability of Trajectory Rod Measurement Using Laser Scanners

Three‐dimensional (3D) technologies contribute greatly to bullet trajectory analysis and shooting reconstruction. There are few papers which address the errors associated with utilizing laser scanning for bullet trajectory documentation. This study examined the accuracy and precision of laser scanning for documenting trajectory rods in drywall for angles between 25° and 90°. The inherent error range of 0.02°–2.10° was noted while the overall error for laser scanning ranged between 0.04° and 1.98°. The inter‐ and intraobserver errors for trajectory rod placement and virtual trajectory marking showed that the range of variation for rod placement was between 0.1°–1° in drywall and 0.05°–0.5° in plywood. Virtual trajectory marking accuracy tests showed that 75% of data values were below 0.91° and 0.61° on azimuth and vertical angles, respectively. In conclusion, many contributing factors affect bullet trajectory analysis, and the use of 3D technologies can aid in reduction of errors associated with documentation.     

Controversial Suicide Case Using a Submachine Gun with a Sound Suppressor—The Need of Team Work of Forensic Chemistry and Firearm Examiners

Evidence materials in a presumed suicide case were studied by a firearm examiner and a forensic chemist. The victim's body with double gunshot wounding in his forehead, a machine gun in the sustained fire mode with a silencer, and four cartridge cases were found. Examinations of the evidence, the case file studies, and experiments dedicated to the case were carried out. Relationships between the placement of cartridge cases and the gun were established using a fast camera. The distributions of gunshot residues on the evidence materials and within the comparative gunshot patterns were studied by means of optical and electron microscopy, X‐ray microanalysis, and infrared spectroscopy. The shooting distance was assessed to be 30 cm or more, whereas the greatest distance that could have been achieved by the victim himself was about 11–13 cm. The obtained results supported the version of homicide rather than suicide.     

Rescuing constructivism from the constructivists: a critical reading of constructivist interventions in Southeast Asian security

Abstract

Constructivist contributions to the study of Southeast Asian security raise much-needed awareness of identity concerns and introduce conceptual and methodological innovations into the study of identity. However, their shared rationalist proclivity to couple subjectivity with sovereignty revives the enduring problem of treating agency as ultimately pre-given. Contrary to their professed aim to restore to security studies an appreciation for history and practice, the contributions of many Southeast Asia constructivists are quite tellingly essentialist, particularly their concessions to state-centrism and ideational/normative determinism, both due partly to an uncritical emulation of rationalist constructivist perspectives in International Relations (IR) theory. In granting ontological priority to states, Southeast Asia constructivists cannot fully transcend reification because their denaturalizing of international anarchy or regions comes at the expense of a reified state. In reifying either the state or ideas/norms, their claim to privilege practice in their analyses of Southeast Asian security becomes suspect. But if process and practice are to be taken seriously, then Southeast Asia constructivists must avoid presuming a preordained subjectivity that invalidates their claim to study social construction.     

Forensic imaging of projectiles using cone-beam computed tomography

In patients with gunshot injuries, it is easy to detect a projectile within the body due to the high-density of the object, but artefacts make it difficult to obtain information about the deformation and the exact location of the projectile in surrounding tissues. Cone-beam computed tomography (CBCT) is a new radiological imaging modality that allows radio-opaque objects to be localised and assessed in three dimensions. The full potential of the use of CBCT in forensic medicine has not yet been explored.In this study, three different modern projectiles were fired into the heads of pig cadavers (n = 6) under standardised conditions. Tissue destruction and the location of the projectiles were analysed separately using CBCT and multi-slice computed tomography (MDCT).The projectiles had the same kinetic energy but showed considerable differences in deformation behaviour. Within the study groups, tissue destruction was reproducible. CBCT is less severely affected by metallic artefacts than MDCT. Therefore CBCT is superior in visualising bone destruction in the immediate vicinity of the projectile and projectile deformation, whereas MDCT allows soft tissue to be evaluated in more detail.CBCT is an improved diagnostic tool for the evaluation of gunshot injuries. In particular, it is superior to MDCT in detecting structural hard-tissue damage in the immediate vicinity of high-density metal projectiles and in identifying the precise location of a projectile in the body.     

Facebook,Contestation and Poor People’s Politics: Spanning the Urban–Rural Divide in Cambodia?

Rural internet use, although still limited, is growing, raising the question of how rural people are using social media politically. As a vehicle of communication that permits the rapid transmission of information, images and text across space and connections between dispersed networks of individuals, does technological advance in rural areas presage significant political transformations? This article investigates this question in the light of a poor result for the Cambodian People’s Party in the 2013 elections, and the subsequent banning of the main opposition party, before the 2018 elections. Expanding internet use in rural areas has linked relatively quiescent rural Cambodians for the first time to networks of information about militant urban movements of the poor. Rural Cambodians are responding to this opportunity through strategies of quiet encroachment in cyberspace. This has had real effects on the nature of the relationship between the dominant party and the rural population and suggests the declining utility of the election-winning strategy used by the party since 1993. However, the extent of this virtual information revolution is limited, since neither the urban nor rural poor are mapping out new online political strategies, agendas or identities that can push Cambodia’s sclerotic politics in new directions.     

ISFG: Recommendations on biostatistics in paternity testing

The Paternity Testing Commission (PTC) of the International Society for Forensic Genetics has taken up the task of establishing the biostatistical recommendations in accordance with the ISO 17025 standards and a previous set of ISFG recommendations specific to the genetic investigations in paternity cases. In the initial set, the PTC recommended that biostatistical evaluations of paternity are based on a likelihood ratio principle – yielding the paternity index, PI. Here, we have made five supplementary biostatistical recommendations. The first recommendation clarifies and defines basic concepts of genetic hypotheses and calculation concerns needed to produce valid PIs. The second and third recommendations address issues associated with population genetics (allele probabilities, Y-chromosome markers, mtDNA, and population substructuring) and special circumstances (deficiency/reconstruction and immigration cases), respectively. The fourth recommendation considers strategies regarding genetic evidence against paternity. The fifth recommendation covers necessary documentation, reporting details and assumptions underlying calculations. The PTC strongly suggests that these recommendations should be adopted by all laboratories involved in paternity testing as the basis for their biostatistical analysis.     

Preparation of a Ytterbium‐tagged Gunshot Residue Standard for Quality Control in the Forensic Analysis of GSR

Preparation of a ytterbium‐tagged gunshot residue (GSR) reference standard for scanning electron microscopy and energy dispersive X‐ray spectroscopic (SEM‐EDS) microanalysis is reported. Two different chemical markers, ytterbium and neodymium, were evaluated by spiking the primers of 38 Special ammunition cartridges (no propellant, no projectile) and discharging them onto 12.7 mm diameter aluminum SEM pin stubs. Following SEM‐EDS microanalysis, the majority of tri‐component particles containing lead, barium, and antimony (PbBaSb) were successfully tagged with the chemical marker. Results demonstrate a primer spiked with 0.75% weight percent of ytterbium nitrate affords PbBaSb particles characteristic of GSR with a ytterbium inclusion efficiency of between 77% and 100%. Reproducibility of the method was verified, and durability of the ytterbium‐tagged tri‐component particles under repeated SEM‐EDS analysis was also tested. The ytterbium‐tagged PbBaSb particles impart synthetic traceability to a GSR reference standard and are suitable for analysis alongside case work samples, as a positive control for quality assurance purposes.