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Blood Spatter Unit

Blood Spatter

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
Created by: TBrylewski