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Blood Splatter
Blood stains
Andre Deason
Projected Stains
Projected stains
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Description
These occur by the blood that travelled in the air. Impact stains occur by when a force is applied to the source of blood and Projected stains occur by the respiratory system, arterial blood vessels or the weapons that caused the injury. These can be splatters, sprays, mists and spurts.
How to Identify
Analysts can tell the direction of the impacting object by the shape of the spatter (tails point in the direction of motion). Counting the arcs can also show the minimum number of blows delivered. Arterial spray - refers to the spurt of blood released when a major artery is severed.
Transfer Stains
Transfer stains
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Description
A bloodstain resulting from contact between a blood-bearing surface and another surface. Void. An absence of blood in an otherwise continuous bloodstain or bloodstain pattern.
How to Identify
Investigators can use chemical reagents such as Luminol to find and photograph latent bloodstains. When sprayed on blood, Luminol creates a bright blue luminescent glow by reacting with iron in the blood's hemoglobin.
Passive Stains
Passive stains
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Description
A bloodstain resulting from contact between a blood-bearing surface and another surface. Void. An absence of blood in an otherwise continuous bloodstain or bloodstain pattern.
How to Identify
Passive stains include drops, flows and pools, and typically result from gravity acting on an injured body. Transfer stains result from objects coming into contact with existing bloodstains and leaving wipes, swipes or pattern transfers behind such as a bloody shoe print or a smear from a body being dragged.