ENTM 12800 Lecture Notes - Lecture 2: Blood Residue, Surface Tension, Horseradish
10 Jul 2017
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A. the examination of the shapes, locations and distribution of patterns of bloodstains in order to provide an interpretation of the physical events by which they are created. What can bpa tell us: con rm/refute someones story, areas of origin based on directionality and angle of the splatter, movement of a body, number of blows/shots, events/sequence. What is blood: four main components red blood cells. 1: white blood cells, platelets, plasma (1) gases (2) ions (3) nutrients. 3. the droplet can burst if the force pulling it apart is great enough. Shape & size: as the height increases, the diameter of the bloodstain increases. B. the angle the blood droplet hits a surface will affect the shape of the stain: speed will affect blood spatter. A. take measurements of length & width, need to determine the direction: arcsin (w/l) = angle of impact, tail determines the direction. Area of convergence: determine directionality of the blood droplets.
