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Suppose a victim called police and notified that an individual devoted a drive-by shooting on his house. Crime scene investigators (CSI’s) then show up to investigate the crime. One of the things they look at is the broken glass through which the bullet or bullets pass. Such proof may tell a story to the technician with a keen eye for the details found in broken glass. The manner in which glass breaks numerous times presents clues with regard to how it was broken. For instance, glass that was broken by a speeding baseball will have a dissimilar pattern of fracture than glass that was broken by a speeding bullet. Particular break characteristics concede a forensic scientist to see to it the direction from which the affect came. They include a particular kind of stress-fracture lines called conchoidal lines. Conchoidal lines are lines that emanate from the internetsite of impact. When observing glass through it is thickness, these lines curve out and away from the point of affect in a curve resembling a seashell curve. If the investigator takes a closer look at the conchoidal lines, he may see tiny lines that radiate almost 90 degrees from the conchoidal lines. These fracture lines are known as hackle marks. Cracks in windows and other flat plates of glass such as windshields tend to radiate and concentrate. When observing the glass perpendicularly from the surface, one may see radial cracks that radiate outward from the affect point. Picture this like the spokes that radiate from the center of a wheel. Again, when looking at the glass perpendicularly from the surface, one would also find cracks that concentrate around the affect point and are called concentric cracks. Concentric cracks are cracks that form growingly larger circles around the affect point. Picture this as a circle within a circle within a circle….all surrounding the affect point. If a speeding bullet strikes a window and penetrates it but does not totally break it, the destruction may leave behind a hole accompanied or not accompanied by the aforementioned fracture lines. On one side of the affect (the entrance side), the hole will be little and clean. On the other side of affect (the exit side), a little conical piece of glass would have been removed. CSI’s would ordinarily view the glass from both sides to determine a bullet’s trajectory; i.e. whether the bullet was fired from the outside of the house in as in the case of a drive-by shooting or vice versa. The next time you watch your bestloved CSI or Forensic Files TV show, you will have a better understanding of how broken glass is studied in a crime lab in order to fetch a perpetrator to justice. |
