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
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?
|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
Transfers occur when a blood source comes
in direct contact with a target surface area.
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|TARGET SURFACE TEXTURE:
|Angle of Impact:
The steeper the impact, the more elliptical or elongated, the
The "tail" points to the direction of the blood drop
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.