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Blood Spatter Unit
Blood Spatter
Question | Answer |
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Types of blood stain patterns | blood drops, impact patterns, transfer patterns, and smears and motion patterns |
What can you learn from bloodstain patterns? | angle of deposit, distance from target, direction of travel, trails, object that caused the pattern, time since deposit, and volume of blood |
What are factors affecting bloodstain patterns? | Energy (low, medium, high), distance, target surface, and angle of deposit. |
Low-velocity pattern | happens when an object moving less than 5 ft/sec strikes a surface, with drops that are 4mm or larger in size |
Arterial bleeding | If an artery is damaged during an assault, suicide attempt or accident, the blood loss may take the form of gushes or spurts |
Cast-off blood | blood that is flung from and object, tends to be fairly uniform trail of droplets |
Medium-velocity spatter | come from objects moving between 5-100 ft/sec. Vary from 1-4 mm in diameter |
High-velocity spatter | occur when an object strikes a victim at a speed faster than 100 ft/sec, the spatters are very small, less than 1 mm in diameter |
Area of convergence | represents the point from which stain emanated |
Void pattern | an absence of blood spatter in an area where you would otherwise expect to see them |
Transfer pattern | result when an object soaked with blood comes in contact with an unstained object |
Wipe | pattern created when a secondary target moves through an existing wet blood stain on some other object |
Swipe | the transfer of blood onto a target surface by a bloody object that is usually moving laterally |