Haag Lucien C
Forensic Science Services, Carefree, AZ, USA.
Am J Forensic Med Pathol. 2012 Mar;33(1):47-53. doi: 10.1097/PAF.0b013e318219888c.
Bullets striking common forms of flat glass with an orthogonal intercept angle result in a cloud of ejected glass fragments that are in concert with the exiting bullet's flight path. This is not the case with strikes at angles other than orthogonal. In these situations, the expelled glass fragments follow a very different course from that of the exiting projectile. This is both counterintuitive and a potential source of serious error in the evaluation and reconstruction of a shooting victim's position and orientation at the moment the victim was struck by a bullet that has passed through a nearby source of glass such as a vehicle side window or a window in a building. The flight path of the ejected glass fragments is, however, predictable and is dictated by the orientation of the plane of the glass opposite the projectile's impact site.In all cases, these expelled glass particles have considerable velocity and can produce pseudostippling of the skin in individuals located downrange of bullet-struck glass and near the projectile's exit site. The distribution and location of such pseudostippling and its relationship to the associated bullet hole in glass have important reconstructive value. A proper and reliable reconstruction of the victim's position in such cases will require the integration of scene information with the autopsy findings.
子弹以正交截角撞击普通平板玻璃时，会产生一团喷射出的玻璃碎片，这些碎片与射出子弹的飞行轨迹一致。非正交角度撞击时情况则不同。在这些情况下，被喷出的玻璃碎片的轨迹与射出的子弹截然不同。这既违反直觉，又是在评估和重建枪击受害者被穿过附近玻璃源（如汽车侧窗或建筑物窗户）的子弹击中瞬间的位置和方向时严重错误的潜在来源。然而，被喷出的玻璃碎片的飞行轨迹是可预测的，并且由与子弹撞击点相对的玻璃平面的方向决定。在所有情况下，这些被喷出的玻璃颗粒具有相当大的速度，并且会在位于被子弹击中的玻璃下游且靠近子弹出口位置的个体皮肤上产生伪点状痕迹。这种伪点状痕迹的分布和位置及其与玻璃上相关弹孔的关系具有重要的重建价值。在这种情况下，要对受害者的位置进行恰当且可靠的重建，需要将现场信息与尸检结果相结合。
