References in periodicals archive ?
Recording blood spatter evidence requires little training.
How much knowledge do officers and crime scene technicians need to preserve blood spatter evidence?
A basic understanding of blood spatter analysis allows the first responding officer, crime scene technician, or detective to assist in correctly collecting and preserving blood stain data at the scene.
However, officers and technicians should have a basic idea of what the blood spatter means, including--
an understanding of the three classifications of blood spatter velocity and what they indicate;
The velocity of the blood spatter when it strikes a surface is, within certain limitations, a strong and reasonably reliable indicator of the speed of the force that set the blood in motion in the first place.
High velocity blood spatter is produced by an external force greater than 100 fps.
An external force of greater than 5 fps but less than 25 fps causes medium blood spatter.
Low velocity blood spatter is created by an external force less than 5 fps (normal gravity) with the stains generally 3 millimeters and larger.
This spherical shape of blood in flight is important for the calculation of the angle of impact of blood spatter when it hits a surface.
When a drop of blood strikes a flat surface, the diameter of the drop in flight will be the same as the width of the spatter on the surface.