ETX 20 Lecture Notes - Lecture 9: Internal And External Angles, Antibody, Blood Residue
1 Jul 2016
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Document Summary
To determine the what, when, and where of bloodshed events. Bpa is the interpretation of the dispersion, shape characteristics, volume, pattern, number, and relationship of bloodstains at a crime scene to reconstruct a process of events. Involves a combination of geometry, physiology, physics, and logic. Solids: red blood cells, white blood cells, platelets, glucose, hormones, proteins, antibodies, antigens, nutrients. Passive/gravity: passive bloodstains are patterns whose physical features indicate they were created without any significant outside force other than gravity and friction. Contact, drop(s), flows, saturation/pooling, free falling volume. Spattered: spatter bloodstains exhibit directionality and are associated with a source of blood being subjected to an external force(s), in addition to gravity and friction. Altered: altered bloodstains are patterns whose appearance indicates the blood pattern has undergone a physical and/or physiologic alteration. Clotted, diluted, dried, diffused, insects, sequences, voids, wipe. Wipe stain: created when an object moves through a pre-existing wet bloodstain.
