Gunshot location through recorded sound: a preliminary report

Using a video tape and three still photographs, we analyze recorded sound to attribute authorship in a fatal shooting incident. We measure the acoustic signature of the scene with four test detonations, and we discuss two methods of processing putative echoes in the audio band of the video. They allow us to locate 11 out of 17 shots, with a precision of 0.4 x 1.0 m2. Combining the location of the shots with the known positions of the participants, we arrive at the clear attribution of eight shots; three other shots (among which is the fatal one) probably issue from the same shooter, who remains unidentified within a small group of men. Our results lead to the exculpation of the main suspect. We analyze the statistical significance of the results, use Monte Carlo simulations to set an upper bound to the probability of false positives, and discuss areas of improvement of the method.     

Who Delivers? Partisan Clients in the Argentine Electoral Market

Why do some parties fail to benefit from patronage in pork‐ridden political systems? This article analyzes the interaction between patronage and partisanship to explain why some incumbents are more likely to benefit from pork politics than others. We explain such differences by focusing on political parties' access to resources (supply side) and voters' dependence on fiscal largesse (demand side). We show how these differences affect the patron's choice of public sector wages and employment. We use subnational level data to show different electoral returns from patronage for the two major political coalitions in Argentina—Peronism and the UCR‐Alianza—and their effect on preferences over public sector wages and employment.     

The Local Voter: A Geographically Weighted Approach to Ecological Inference

Drawing inferences about individual behavior from aggregate ecological data has been a persistent problem in electoral and behavioral studies, in spite of important methodological advances. In a recent article Anselin and Tam Cho (2002) provided Monte Carlo evidence that King's Ecological Inference (EI) solution will produce biased estimates in the presence of extreme spatial heterogeneity. In this article we provide further empirical evidence that supports their findings and shows that in the presence of spatial effects the residuals of Goodman's naïve model exhibit the same spatial structure that King's local  B ^B _i  estimates. Solving for extreme spatial heterogeneity, it is argued here, requires controlling the omitted variable bias expressed in the spatial structure of much ecological data. In this article we propose a Geographically Weighted Regression approach (GWR) for solving problems of spatial aggregation bias and spatial autocorrelation that affect all known methods of ecological inference. The estimation process is theoretically intuitive and computationally simple, showing that a well-specified GWR approach to Goodman and King's Ecological Inference methods may result in unbiased and consistent local estimates of ecological data that exhibit extreme spatial heterogeneity.     

Application of mist to fingermark detection: Misting with high-boiling-point liquid containing p-dimethylaminocinnamaldehyde and cyanoacrylate

In order to detect latent fingerprints that could be damaged by liquid or powder reagents, non-destructive processes such as gaseous reagents have been developed. In this report, we propose the use of fine mist generated when hot vapor of high-boiling-point liquids is rapidly cooled by surrounding air for fingermark detection. Octyl acetate (OA), 2-phenoxyethanol (2PE), and methyl decanoate (MD) were found to efficiently produce mist when heated to 230°C. By combining these liquids with p-dimethylaminocinnamaldehyde (DMAC) and cyanoacrylate (CN), our team demonstrated effective fluorescence staining of cyano-treated fingermarks using DMAC/OA misting or DMAC/2PE misting, and one-step fluorescence detection of latent fingermarks without cyanoacrylate treatment using DMAC/OA/CN misting or DMAC/MD/CN misting. Fingermark fluorescence was efficiently observed by excitation with a blue LED light (max. wavelength 470 nm) equipped with an interference filter and passing through a 520 nm long-pass filter. We successfully obtained fluorescent images from fingermarks on several substrate materials using the developed misting method.     

Evaluation of the (hu)MANid program for sex and ancestry estimation in a diverse,contemporary CT scan-based sample

Human remains from forensic and bioarcheological contexts are often fragmentary, requiring methods for estimating a forensic profile that are based upon limited skeletal features. In 2017, Berg and Keryhercz created an online application, (hu)MANid, that provides sex and ancestry estimation from mandibular morphoscopic traits and linear measurements. In this study, we examine the utility of the (hu)MANid application in a diverse, urban US adult sample (aged 20–45; n = 143) derived from computed tomography (CT) scans. We secondarily conduct a preliminary analysis of the program's utility in a sample of adolescents (aged 15–17; n = 40). Six morphoscopic, and eleven morphometric traits were recorded as directed by the literature associated with the (hu)MANid program. Percent correct classification and posterior predictive values were calculated for the sex and ancestry estimations output by the program; chi-squared tests were employed to compare self-reported and predicted ancestry. In the adult sample, sex was accurately predicted for 75.52% of the sample. Ancestry prediction, however, was less favorable ranging from 19.3% to 50% correct. For the adolescent sample, correct sex estimation (45%) did not surpass what could occur by chance alone, though ancestry prediction fared better than in the larger adult sample (percent correct prediction overall average: 47.5%, range 35.71%–71.43%). The (hu)MANid application shows utility for use with CT scan-derived adult samples for sex estimation, but caution is warranted for ancestry estimation and use with samples that may not have reached full adult maturity.     

Prevalence of xylazine in overdose cases: An analysis of Miami-Dade County medical examiner case data

Xylazine sedative, muscle relaxant, and analgesic used in a veterinary setting. Although xylazine was never approved for therapeutic use in humans, it has become popular in the street drug market as a cutting or bulking agent in the fentanyl and heroin supply. Recently, there has been a significant increase in the detection of xylazine in postmortem forensic toxicology casework. Xylazine can be identified during routine toxicology screening utilizing instrumentation such as gas chromatography–mass spectrometry and liquid chromatography–mass spectrometry. Using the Miami-Dade Medical Examiner's LIMS system, all cases received between 2015 and 2022 in which xylazine was reported were reviewed. The cases studied include accidental drug overdose deaths in Miami-Dade County as well as Collier County (Naples), Florida. In total, there are 170 cases; the majority are accidental polydrug overdoses involving White males between the ages of 25 and 44 years old. Of the 170 cases, 37% listed xylazine as the cause of death. 13% of cases contained only xylazine and fentanyl while the remaining 87% of deaths were attributed to polydrug toxicity involving two or more substances. The prevalence of xylazine can be attributed to its increasing popularity rather than an increase in caseload. In 2019, xylazine was present in only 4% of all accidental fentanyl overdoses. By 2021, this percentage has increased sixfold, with xylazine present in 24% of all accidental fentanyl overdoses. Despite a decrease in fentanyl overdoses in 2022, the percentage of xylazine detection remained the same.     

Two regionalisms,two Latin Americas or beyond Latin America? Contributions from a critical and decolonial IPE

This article reconsiders the hegemonic interpretation of Latin American regionalisms, which have been defined as expressions of the fragmentation power of ideologies. After identifying the main bias and limitations of this approach, two alternative analytical proposals are presented: critical International Political Economy (IPE), which reconsiders the region’s heterogeneity as the reflection of a variety of historical trajectories; and the increasingly influential Latin/Latin American modernity/coloniality approach, which re-authorises the voices of a multiplicity of ‘marginal’ subjectivities to the cognoscible world of international studies.