2005式9mm警用转轮手枪射击弹壳痕迹研究

目的 研究2005式9mm警用转轮手枪射击弹壳痕迹,为警用转轮手枪射击弹壳痕迹检验鉴定提供理论依据.方法 预实验中选取10把警用转轮手枪以单动、联动方式分别射击收取弹壳样本,观察识别射击弹壳上各个痕迹的位置、形态及相互关系;补充验证实验中选取其中5把警用转轮手枪以单动方式分别进行射击实验,完善、验证预实验中得出的结论.结果警用转轮手枪射击弹壳上的烟垢痕迹、弹底窝痕迹及击针头痕迹的分布位置、形态具有规律性,具备检验鉴定价值.结论 利用弹底窝痕迹、烟垢痕迹结合击针头痕迹,可以实现射击弹壳的准确定位;利用烟垢痕迹、弹底窝痕迹及击针头痕迹具有推定弹壳先后射击顺序的可能性;通过弹底窝痕迹、击针头痕迹的细节特征比对,可以实现射击枪支的同一认定.     

“非致命”并非不致使——慎用9mm警用转轮手枪橡皮弹

9mm警用转轮手枪橡皮弹于2005年底通过公安部组织的技术鉴定。 该弹由弹头、弹壳、底火、发射药四部分构成，弹头由橡塑材料和金属粉末融合而成。它是为在近距离内制止违法犯罪行为、在中远距离起到驱散和战慑作用而研制的“非致命弹药”。     

“非致命”并非不致命——慎用9mm警用转轮手枪橡皮弹

9mm警用转轮手枪橡皮弹于2005年底通过公安部组织的技术鉴定。该弹由弹头、弹壳、底火、发射药四部分构成,弹头由橡塑材料和金属粉末融合而成。它是为在近距离内制止违法犯罪行为、在中远距离起到驱散和威慑作用而研制的"非致命弹药"。     

64式77式手枪射距与射入口特征关系的实验研究及应用

本文为准确推断射距提供了参考依据。通过从不同射距分别对新鲜白净猪皮发射22发64式、23发77式手枪弹的实验,研究了射距与射入口孔径及射入口周围烧伤、烟晕、火药颗粒、挫伤轮、擦拭圈之间的特征关系。结果表明这两种枪支射距在10cm内有烧伤痕,25cm内有烟晕,10cm以外均有明显的挫伤轮与擦拭圈,64式手枪95cm、77式手枪100cm内可见火药颗粒,并经检案应用,证明本实验结果对推断射距有较高的实用价值。     

枪弹创前置物射入口形态学的实验研究

为建立前置物射入口与典型射入口的检验鉴别方法，使用国产54式7.62mm口径手枪及56式7．62mm口径半自动步枪，以3m的距离射击约克夏种白猪义3只，同时以各种玻璃、木板。汽车门、动物躯干等物质作为中间障碍物，制成前置物射入口36例，并与对照组6例射入口进行对比观察。结果显示，前置物射入口较典型射入口增大，撕裂，创线挫伤增宽，创周出现卫星创或假点彩，创道内异物及弹头严重变形。此检验诊断方法有助于法医在实际检验中对射击距离的判断和对现场环境的分析。     

92式手枪射入口形态特征与射击距离的关系

目的研究手枪射入口形态特征与射击距离的关系,为射击距离的推断提供依据。方法选择92式手枪,在带皮的猪肉上覆盖白色棉布,设计了0m,0.1m,0.2m,0.5m1.0m,1.5m,3.0m,5.0m,10m,15.0m,20.0m,25.0m共12个射击距离,对白棉布和肉皮上的弹孔进行拍照,对比研究不同射击距离的射入口形态特征,并利用Autocad软件对射入口的面积进行计算。结果白棉布和肉皮上射入口的形态特征与射击距离有一定的相关性。结论根据射入口的形态特征,能够对射击距离进行推断,对涉枪案件中射击距离的判断有参考价值。     

枪弹创后置物射出口形态学的实验研究

为建立后置物射出口与射入口的检验鉴定方法，使用国产五四式7．62mm口径手枪及五六式7．62mm口径半自动步枪，以5米的距离射击约克夏种白猪18只，同时以木板、水泥板、玻璃及衣服等作为射出口衬垫物，制成后置物射出口56例，并与对照组12例射出口进行对比观察。结果表明，射出口与后置物距离在3cm以内均可出现创缘伸展轮及皮下出血，且与后置物质地及距离成正比。根据其形态分为典型及非典型两类，并建立了此类射出口的检验方法及其与射入口鉴别的依据，有助于法医在实际检验中对射击方向的判断。     

头发对射击残留物附着的影响

利用射击残留物的存在和分布形态判断枪口与射入口的距离是现场分析的关键之一。然而我们在工作中发现,在对头部射击的案件中,弹孔周围的头发有可能对射击残留物起到屏蔽作用,尤其在贴近距离[1](2cm~5cm左右)射击的时候,绝大部分射击残留物会附着在头发而不是头皮上,本文将以实验和真实案例为基础详细说明近距离射击时头发对射击残留物附着的影响。     

六四式手枪弹壳发射顺序的研究

目的　研究六四式手枪射击弹壳的排序规律。方法　对已知顺序实弹射击取样 ,显微观察弹壳上发射过程中形成的痕迹 ,通过统计、归纳 ,从中发现与排序有关的痕迹特征 ,及其与发射顺序之间的关系。结果　研究发现 ,因子弹发射顺序不同 ,弹壳上出现的抛壳挺痕的高低 ,弹底边缘压擦痕的有无轻重 ,推弹突笋痕迹的形状位置与发射顺序有关。结论　根据抛壳挺等痕迹的具体形态 ,及变化特点 ,可判断出六四手枪弹壳的发射顺序。     

霰弹枪损伤判断失误1例

霰弹枪近距离射击时,所形成的损伤具备一般枪弹损伤的特征,但远距离射击时所形成射入口的形态不规则,因表现多种多样,易导致判断失误。笔者遇到1例,现报道如下。1案例资料简要案情张某,男。2004年12月17日20时许被人打伤,右面部有一伤口流血不止,处于昏迷状态,即送往医院,经紧急抢救无效,于当日24时许死亡。现场勘验现场位于某仓库门前。1辆黑色帕萨特轿车头东北、尾西南停靠在大门南面路东侧。车上有散在分布的小块人体组织碎块及血滴。车钥匙掉在车门前下方地面上。车西北侧1m处地面上有30cm×40cm血泊,周围路面上无刹车痕迹及可疑散落物…     

Wounds caused by contact with muzzle-lift relief ports (Mag-Na-Port).

Fan-shaped stippled burns were produced on the skin when a revolver whose barrel had been modified by the Mag-Na-Port process was fired twice with the side of the muzzle in contact. A grazing wound was produced by one bullet, and an oblique entry was produced by the other. The characteristics of Mag-Na-Port wounds and test shots are described, and these are compared with test shots from two other higher power revolvers.     

The effect of the THV bullet in animal tissue

The Très Haute Vitesse (THV) bullet was introduced to meet the requirements of law enforcement officers, as an alternative to larger calibre fully jacketed bullets, since expanding or exploding bullets are not relevant in Europe. To examine the effect of the THV bullet in tissue, especially the size of the lesion and the degree of overpenetration, 11 recently killed pigs were shot with the weapons used by the Danish Police Force and a 9-mm pistol for reference. The ammunition was THV in the calibres 7.65 mm, 0.38, and 9 mm, using conventional fully jacketed bullets for comparison. The lesions were considerably larger when the THV bullet was used, the entry wound in particular, being roughly twice the diameter in the case of the THV bullet as compared to the fully jacketed bullet of similar calibre. Only one 7.65-mm THV bullet overpenetrated the target when fired against the thorax or abdomen of the pigs and then with only minimal residual energy. All fully jacketed 7.65-mm bullets, all 0.38 bullets, with the exception of one THV bullet, and all 9-mm bullets overpenetrated the target. The 7.65-mm THV bullet produced a lesion which in its extent resembled that of the fully jacketed 9-mm bullet, and should be a suitable alternative for the Danish Police Force.     

A study of the morphology of gunshot entrance wounds, in connection with their dynamic creation, utilizing the "skin-skull-brain model"

The goal of this study was to document the dynamic effects created within, and the developing mechanisms of a gunshot entrance wound to the skin utilizing high-speed photography and the "skin-skull-brain model". The high-speed photography was taken with an Imacon 468/Hadland-Photonics camera. Full metal jacketed, 9 mm Luger projectiles were fired at the target model from a distance of 10 m. During the evaluation of the "skin-skull-brain model", it was possible to show that injuries inflicted to this model are fully comparable to the morphology of equivalent real gunshot entrance wounds. It has been possible to document and study the dynamic process of the "bullet-skin-interaction" in the gunshot entrance wound. The development of the morphologic terms of the entrance wound are discussed. In combination with high-speed photography, this "skin-skull-brain model" is a perfect tool for the documentation and the study of the dynamic development of gunshot entrance wounds in the skin.     

Discordance of Gross and Histologic Findings in Estimating the Range of Fire of Gunshot Wounds

Forensic pathologist use soot and/or stippling surrounding entrance gunshot wounds in categorizing range of fire. If absent, some pathologists suggest utilizing histology when the range is diagnostically critical. This study investigates the concordance of macroscopic and microscopic findings in estimating range of fire by evaluating gunshot entrance and exit wounds made through human tissue analogs at defined distances using two handgun calibers. Examination of over 150 entrance wounds verified the ease of visually detecting soot from a muzzle distance of contact to 1 foot (30.5 cm), and its absence at 9 feet (274.3 cm). Distinctly apparent was bullet wipe surrounding the entrance wounds regardless of muzzle distance. Although variations existed, dark material was histologically identified in many skin, soft tissue, and bone sections at all ranges with both calibers. These nonparallel results decrease the dependability of histology for range of fire estimation and reinforce using gross observation.     

Estimating Projectile Perpendicular Impact Velocity on Metal Sheet Targets from the Shape of the Target Hole

Abstract:  The correlation between bullet hole shapes in metal and projectile impact velocity was examined. A series of shots were fired from an M-16A1 assault rifle of 5.56 mm caliber toward a 1-mm thick metal target. All shots were fired at a perpendicular angle to the metal sheets, and the velocity was measured just before the projectile hit the target. Velocities ranged between 400 and 900 m/sec. From the replica of the shooting hole, a perpendicular plane was created, showing the symmetrical properties of the hole. The best mathematical equation describing the shape of the entrance hole was the exponential function in the form:
The empirical equation of the hole defined using the regression method is:
This equation describes the general shape of shooting holes created by velocities ranging from 440 to 750 m/sec. From this equation, one can estimate the bullet velocity when it hits the target.     

Confusing injury findings in a suicidal gunshot fired to the chest from a carbine with a sawed-off barrel

The stellate bullet entrance wound is one of the facultative features of a contact shot. For the formation of a star-shaped wound two factors are of special importance: first, an extensive bony support underlying the skin in the entrance region, and second, a strong propellant charge of the cartridge fired. Contact shots to the precordial region usually do not cause stellate entrance wounds, even if high-powered rifle ammunition is used. In the reported case, an injury pattern was observed that was not in line with normal findings and seemed confusing at first. Following a suicidal gunshot to the chest from a sawed-off carbine 98a (cal. 8 x 57 Js), a 4.5 cm wide, gaping bullet entrance wound with radiating tears was found. Instead of the usual pocket, the anterior thoracic wall showed a fist-sized area of destruction with extensive undermining of the subcutis. Not far from the entrance hole, a rib fragment had become displaced retrogradely thus perforating the skin from the inside out. The unusual pattern of findings could be explained by the fact that the barrel had been sawed off: as a result of this manipulation, a considerable part of the propellant charge had been converted outside the barrel, i.e. in the initial section of the bullet path.     

Morphology of bullet entrance wounds in palms and plantae (author's transl)

Tests shots with hand weapons of .22, .25, .32, .357, and .45 calibre were made to find out whether bullet entrance wounds in palms and plantae are very different from such wounds in other parts of the body. As far as shots without contact between muzzle and skin were concerned, the following characteristics were noticed: (1) Entrance holes from pistols and revolvers of the same calibre were smaller in palms and plantae than in other parts of the body. (2) There is no abrasion collar as typically found in other regions. (3) The corneum of epidermis around the entrance hole is lifted off and torn radially. These unusual findings are most probably the result of the particular texture of the palmar and plantar epithelium.     

Radiodense bullet wipe around osseous entrance gunshot wounds

“Bullet wipe” is the material deposited by a bullet on any surface with which it comes into contact after it is fired and may contain debris from the gun barrel, including particles of primer and metal fragments from previously fired bullets. X‐ray analysis is a non‐destructive method by which traces of metallic elements can be visually detected. The analysis of osseous defects for radiodense bullet wipe (RBW) assists in determining the presence or absence of perforating gunshot wounds, especially in fragmented, skeletonized remains. The aim of our current study was to determine the frequency of RBW around entrance firearms injuries that perforated bone. We prospectively analyzed entrance gunshot wounds for RBW over a three‐year period using digital X‐ray analysis (n = 59). We retrospectively reviewed the corresponding autopsy reports to determine the frequency of RBW by biologic sex, reported ancestry, age‐at‐death, location of wound, manner of death, range of fire, bullet caliber, and presence of bullet jacket. Data were analyzed by Fisher's exact test or Chi‐square test with significance levels accepted at p < 0.05. RBW was present in 66% (n = 39) of examined cases. Decedent characteristics did not significantly alter RBW distribution, including biologic sex (p = 0.75), reported ancestry (p = 0.49), and age‐at‐death (p = 0.43). Additionally, the location of the osseous entrance gunshot wound, manner of death, range of fire, and cartridge caliber did not affect RBW detection. All cases involving non‐jacketed rounds (n = 5) showed RBW (p = 0.30). To our knowledge, this study is the first to report the frequency of RBW detection from osseous entrance gunshot wounds.     

Identification of gunshot residues in fabric targets using sector field inductively coupled plasma mass spectrometry technique and ternary graphs

During criminal investigations involving firearms, the detection of gunshot residues (GSRs) is one of the most important evidences. In the present study, a new method to identify trace evidences of GSRs, deposited around the bullet entrance hole, in different types of fabrics used as targets, is described. The experiments were carried out using a 0.38-inch caliber revolver, and 9-mm and 0.40-inch caliber pistols. Testimonies of 2.25 cm(2) of the fabrics were cut around the bullet entrance and digested with 10% nitric acid. Antimony, barium, and lead were analyzed in the remaining solution using a sector field inductively coupled plasma mass spectrometer. The concentrations of the elements were detected at levels up to few microgram per square centimeter. The use of ternary graphics allowed us to identify specific patterns of distribution for blank samples and the clear distinction between the revolver and pistols used.     

Formation of a "crow's foot pattern" in the smoke residue in homicide by forehead gunshot injury

We report a "crowsfoot-like" pattern in the smoke marks around the entrance of a close-range bullet wound in the center of the forehead; the weapon in this homicide was a revolver. This pattern only occurs if the facial muscles that form expression are completely contracted at the moment the shooting occurs and if the victim expects the event. The wrinkles gather around the entrance of the bullet, and this wound pattern may indicate that the shot was expected by the victim and represent a piece of the mosaic that might help clarify the circumstances in a case.