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When Blood Drops Fall Kevin Patrick Smith When Blood Drops Fall read without register
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Gunshot spatter will vary depending on the caliber of the gun, where the victim is struck, whether the bullet exits the body, distance between the victim and the gun and location of the victim relative to walls, floors and objectsThe blood droplets are pretty much round when travelling through the air but deform into various shapes and patterns when they land on a hard surfaceAfter the bloodstain pattern evidence has been photographed in an unaltered state, measurement scales should be positioned around the patternIf a blood drop is deposited on a smooth, hard, nonporous surface, the shape of the bloodstain as well as the width-to-length ratio can be used for pattern reconstruction and interpretationFigure 9 A cast-off bloodstain pattern
As the blood falls through the air, it takes the shape of an oscillating sphereBloodstain patterns that result from large volumes of falling blood will vary in appearance due to the effect of the distance the blood falls to the target surfaceThe maximum diameter for the bloodstain occurs after the drop has fallen approximately 1.8 m (6 ft)In low force events (sometimes referred to as low velocity), the number of blood drops put in flight is low and the size of the droplets tend to be largeArterial Spurt / Gush Bloodstain pattern(s) resulting from blood exiting the body under pressure from a breached artery: 14 Transfers occur when a blood source comes in direct contact with a target surface areaIn addition, trails can be characterized by drag marks rather than droplets of bloodExpirated spatter - is usually caused by blood from an internal injury mixing with air from the lungs being expelled through the nose, mouth or an injury to the airways or lungsThere are many different techniques that are currently in use for the documentation and reconstruction of bloodstain pattern evidence
Types of Blood Spatter (Patterns) Detectives use the knowledge they gain from blood spatter analysis to figure out how the blood pattern was made and hence, how the person who bled was injured, where they were standing when injured, how long ago the crime was committed, and so onSpines The pointed edges of a stain that radiate out from the spatter; can help determine the direction from which the blood Parent Drop traveledWhen blood drips from an open wound or from a bloody object as it moves horizontally, a blood trail will occurWhen a blood-coated object is swung forcefully, most of the blood will be cast-off during the back swingDirectionality 7 171bf2437f