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Blood and tissue spatter associated with chainsaw dismemberment
1Department of Pathology, University of South Dakota Sanford School of Medicine, Sioux Falls, SD 57103, USA. fornsix@aol.com
Journal of Forensic Sciences
|September 10, 2009
Summary
This study investigated chainsaw dismemberment, finding that blood and tissue spatter patterns depend on chainsaw orientation. Proper orientation minimizes spatter, aiding forensic investigations.
Area of Science:
- Forensic Science
- Taphonomy
- Bio-mechanics
Background:
- The dismemberment of human remains presents unique forensic challenges.
- Understanding blood and tissue spatter patterns is crucial for scene reconstruction.
- The paucity of spatter at a crime scene can be misleading without experimental data.
Purpose of the Study:
- To investigate the spatter patterns produced during chainsaw dismemberment.
- To determine the influence of chainsaw orientation on blood and tissue deposition.
- To compare chainsaw-induced striations on bone with those on wood.
Main Methods:
- Dismemberment of two large pig carcasses using a small electric chainsaw in a controlled laboratory setting.
- Systematic variation of chainsaw bar and discharge chute orientation relative to the cutting surface.
- Visual documentation and analysis of blood and tissue deposition patterns.
Main Results:
- A small electric chainsaw can effectively dismember large animal carcasses.
- Holding the chainsaw bar parallel to the ground results in minimal lateral spatter.
- Off-axis discharge chute orientation significantly increases lateral spatter and deposition distance.
- Chainsaw striations are observable on bone, similar to wood.
Conclusions:
- Chainsaw spatter patterns are highly dependent on the tool's orientation during use.
- Minimal spatter does not necessarily indicate a lack of dismemberment activity.
- Chainsaw striations on bone can serve as a unique identifier of the tool used.
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