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Analysis: 1. Distance from the blood source to the target 2. Direction of travel and impact angles 3. Nature of the force used to cause the bloodshed 4. The object used to cause the bloodshed 5. Sequencing of multiple bloodshed events 6.Interpretation of contact or transfer patterns When properly documented, bloodstain patterns found at the crime scene, or on a particular person's clothing, can be used to: 1. Confirm or refute the position of a victim, witness, suspect, or defendant 2. Determine if there is evidence of a struggle, or if the assault is "one sided" 3. Confirm or refute statements made by principles in the case: IE: Are stain patterns on a particular person's clothing consistent with accounts given by the victim, witness, or defendant? |
SPATTERS
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SPATTER VS TRANSFER: The simplest type of blood spatter analysis is determining spatters from transfers. Spatters are produced when a source of liquid blood is acted upon by an external force. The blood droplets, created by the force, travel through the air before landing on a target surface. Transfers occur when a blood source comes in direct contact with a target surface area. |
To cite this website: Crime Scene Forensics, LLC, Concord, NC; www.crimescene-forensics.com © 2018 - Crime Scene Forensics, LLC - All Rights Reserved |
TARGET SURFACE TEXTURE:
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DRIP STAINS
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Angle of Impact: The steeper the impact, the more elliptical or elongated, the blood drop |
Direction: The "tail" points to the direction of the blood drop |
Spatter |
Transfer |
GUNSHOT SPATTER high force impact spatter may be directed back toward the gun that fired the shot. This is known as back spatter amount of high force impact spatter may be directed in the same direction as the bullet. This is known as forward spatter |
Bloodstain Pattern Analysis: is the examination of the shapes, locations, and distribution of patterns of bloodstains, in order to provide an interpretation of the physical events that gave rise to their origin. The analysis may be performed on scene, in a laboratory setting, or in an office by reviewing case materials, such as photographs and reports. Bloodstain Pattern Analysis is a general or class characteristic science and opinions are often expressed in more general terms. For example, the analyst may be able to identify particular bloodstains or bloodstain patterns at a scene, and then offer one or more possible mechanisms by which those stains or patterns were created. The opinions may then be applied to the overall case investigation or scene reconstruction. Crime Scene Forensics, LLC offers complete review of cases involving bloodstains. It is important to understand that Bloodstain Pattern Analysis is one component of a crime scene investigation. The analysis of the bloodstains need to considered in the context of the scene and its associated evidence. We will incorporate all the case facts and render opinions based on case facts and scientific principles. |
Below are some quick facts and information regarding bloodstain pattern analysis. For further information, or to request a CV or fee schedule, please contact us |
The amount of high force impact spatter created will depend upon the size or caliber of the bullet fired, as well as the distance from the muzzle of the gun to the target. The larger the bullet, the greater the potential for more significant spatter. The closer to the target that the gun is fired...the greater the potential for more significant spatter. |