Assessment of injuries patterns produced by a 9mm P.A.K "rubber ball" blank firing weapon: porcine model.

The use of less lethal weapons aims to mitigate civilian casualties caused by firearm use. However, due to numerous cases in which these weapons caused serious injuries, even lethal injuries, both legislation and the forensic field are interested in characterizing and regulating them better. In the forensic field, there is a lack of strong research about injury patterns of these weapons which makes it difficult to identify the type of weapon employed. In this study, the main objective was to characterize the injury pattern produced by the impact of the 9 mm P.A.K. projectile. A porcine model was used. Four different distances were studied: firm contact, 10 cm, 60 cm and 110 cm, using 3 of the more representative anatomical sites: the head, the hind leg and the ribs. The average measurement of the entrance orifice varied according to the anatomical site, being 6.67 mm wide and 6.25 mm long in the thorax, 7.3 mm wide and 8.8 mm long in the hind legs, and 7.62 mm wide and 7.54 mm long in the head. The variation in width and length measurements was not found to be directly related to the shot distance. The gunshot residues had similar characteristics to those of conventional lead projectiles, however there was more unburned powder deposit near the wounds, with a less dense soot and more dense powder tattoo. Depth varied widely regardless of tissue and firing distance, although loss of penetrating power and injury is observed as one moves away from the target.

Assessment of bullet holes through the analysis of mushroom-shaped morphology in synthetic fibres: analysis of six cases.

Textiles damage analysis is a very valuable tool in forensic investigations. However, to date, very little research has been carried out to understand the impact of bullet causing damages to clothing. According to the review of the most recent scientific papers, the frictional heating and crushing action of a bullet passing through synthetic fibres cause a unique transformation in their ends called mushroom-shaped morphology. In this study, the textile remains of six individuals executed during the first decade of the Chilean military dictatorship period (1973-1990) were analysed. The purpose was to examine their clothing in order to describe the fibre defects in the bullet holes. The fibres were directly observed using two different models of stereomicroscopy (MZ16A and EZ4D, Leica Microsystem Ltd., Wetzlar, Germany) and through a combination of transmitted, oblique and co-axial illumination (with Leica DFC500 Digital Camera), at × 230 and at a resolution of up to 840 Lp/mm. The mushroom-shaped morphology, along with rupturing of yarns, fibrillation or splitting of fibres, was observed in the bullet holes. Although the mushroom-shaped is a useful pattern for bullet hole identification in synthetic fibres, further research needs to be performed for developing a sounder interpretational framework of this type of forensic evidence.

A Reevaluation of the Death of Vincent van Gogh: Suicide or Murder? The Need for a Definitive Autopsy.

Vincent van Gogh died on July 29, 1890, from an apparent gunshot wound to the belly sustained approximately 30 hours earlier on July 27. Although little is known how Vincent sustained his mortal wound, art historians have long believed that the death was the result of a suicide, a widely accepted "truth" for the mysterious death of the then unknown and now iconic artist. The basis and validity of this suicide narrative is still very hotly debated among van Gogh scholars to this day. We dug deeper into all the circumstantial evidence and testimonies to arrive at a comprehensive overview of the probability that it was likely impossible for Vincent to self-inflict his mortal wound.We used all the available circumstantial evidence related to the day Vincent van Gogh was wounded to present the information and conclusions as if we were before a judge as expert witnesses to answer the question: suicide or murder? If Vincent did not shoot himself in the belly (a red flag in and of itself), whoever inflicted that penetrating wound into his abdomen murdered him. In our study, results from firing the same model revolver that allegedly killed Vincent from various ranges (direct contact, intermediate, and distant) demonstrated within a reasonable degree of medical probability (greater than 50%) that it was not probable for Vincent van Gogh to shoot himself without a described powder burn.With little forensic evidence to rely on 130 years after the suspicious event, many have suggested a respectful exhumation and graveside autopsy utilizing 21 century techniques to bring resolve to this 19 century cold case. This crime, whether suicide or murder, has generated renewed interest and numerous questions surrounding the suspicious death of the most iconic artist of the 19th century. These missing forensic facts will remain buried with all the secrets Vincent took with him to his grave, unless a definitive autopsy is performed. What an autopsy could add to our forensic fact basis and understanding of this intriguing cold case is enormous and further delineated as the next step to answer these difficult, otherwise unanswerable questions and allow us to finally sign off on his death certificate with certainty.It is clearly impossible to definitively prove suicide or murder, but it is also impossible to disprove murder given the data and arguments offered in this analysis. A physician's opinion is based on the material available to him, and in this case, "our opinion as to the cause and manner of death is based on the limited amount of forensic information available. It is, therefore, our opinion, based on that limited information that in all medical probability, the cause of death is not a self-inflicted wound by Vincent van Gogh, and, thus, in all medical probability, a homicide."

Computational Approach to Identify Different Injuries by Firearms.

Complications arise in the analysis of gunshot wounds to the maxillofacial region, when neither the projectile nor the gun is found at the crime scene. We simulated 5- and 15-cm firing distances at a human mandible to investigate the external morphology of entrance wounds based on fire range. The ammunition models, .40-caliber S&W, .380-caliber, and 9 × 19-mm Luger, were constructed with free-form NURBS surfaces. In a dynamic simulation, projectiles were fired against mandibular body 3D model at 5 and 15 cm. All entrance wounds presented oval aspect. Maximum diameter and von Mises stress values were 16.5 mm and 50.8 MPa, both for .40-caliber S&W fired at 5 cm. The maximum energy loss was 138.4 J for .40 S&W fired at 15 cm. In conclusion, the mandible was most affected by .40-caliber S&W and morphological differences were observable in holes caused by different incoming projectile calibers fired at different distances.

A new method for collection and identification of gunshot residues from the hands of shooters.

This work presents a novel collection method for gunshot residues (GSR) using a sampling procedure based on ethylenediaminetetraacetic acid (EDTA) solution as a complexing agent on moistened swabs. Detection was via a sector-field inductively coupled plasma mass spectrometry (HRICP-MS). The proposed collection and analytical method allowed detection of antimony (Sb), barium (Ba) and lead (Pb) after .38 shot tests. at detection limits of less than 1 microg L(-1) in four different areas of the hands of volunteers. This paper includes a discussion concerning hand areas near the thumb and forefinger as being more suitable for GSR collection as well as a comparison between differences observed using 2% diluted EDTA. 2% nitric acid solution, and simple deionized water as collecting solutions, proving the superior efficiency of EDTA in GSR recoveries.