Pattern Types
Passive
Bloodstains created by only the force of gravity acting on the blood creating the bloodstains. The following are secondary classifications that are a subset of passive [wp_glossary id=”61″]bloodstain patterns[/wp_glossary].
Single blood drops that are relatively round with almost no satellite spatter, formed due to gravity only.
A pattern formed from a liquid dripping into another drop of liquid, where at least one of the liquids is blood.
A pattern that is formed from the blood dripping off of a moving object or person onto the ground outlining the [wp_glossary id=”63″]direction of movement[/wp_glossary].
A bloodstain pattern that forms by gravitational forces causing movement of a small or large volume of blood from the initial droplet
A form of bloodstain that has no particular pattern but indicates that there was an accumulation of a large volume of blood on a specific substrate and will take its shape with no satellite spatter.
Small drops distributed around the main blood droplet. The degree of the spatter depends on nature of the surface the blood spatter is found on.
A form of bloodstain that has no particular pattern but indicates that there was an accumulation of a large volume of blood on a porous substrate(ex. sheets, pillows, carpet) thus has been absorbed into its matrix. Once the material has maximized in absorption the blood begins to pool on the surface.
A form of pattern formed from blood falling into other blood; usually larger volumes or dropping from higher heights resulting in more satellite spatters.
Spatter
Bloodstains resulting from a blood drop encountering an external force that will cause it to break apart resulting in dispersion.
Ablood bearing object is put into motion causing the blood of the object to be released tangentially to the object’s movement and landing on a nearby surface.
A bloodstain pattern made from the expulsion of blood through the mouth, nose, or respiratory system; can consist of mucus or bubbles in the blood spatter.
A bloodstain resulting from an object forcefully impacting a blood source. This results in the blood spraying away from the impact site.
formed by the blood being propelled out of a breached vessel, often an artery.
A high-velocity bloodstain pattern made from a bullet impacting a blood source, results in a mist-like fine drop deposition on a surface.
Transfer
Bloodstains resulting from the contact between two surfaces where one has blood and the other does not; sometimes can consist of friction ridge patterns.
Atype of transfer pattern where a moving object with blood makes contact with a surface with no blood on it and as it moves along the surface it transfers blood onto the second surface; the [wp_glossary id=”63″]direction of movement[/wp_glossary] can be inferred.
A surface wet with blood is brought into contact with another surface. The object that is used in the transfer can leave behind a partial or a full imprint and it may indicate the [wp_glossary id=”63″]direction of movement[/wp_glossary] of the object.
A type of transfer pattern where a moving object with no blood makes contact with a surface with blood on it and moves along it causing the blood to move along and spread out; the [wp_glossary id=”63″]direction of movement[/wp_glossary] can be inferred.
