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Blood Spatter Analysis
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The point of origin
Velocity of blood drops
This is the part where the blood initially came from and the most large pool of blood.
expiratory blood
1970s Blood stain analysis system
blood is splattered on a objet , as a result of breathing; this occurs when an injury is to the throat, mouth, or airway
Blood stain analysis in the 1970s used a system based on the velocity of blood drops at impact.
Low velocity impact splaters- blood dripping using gravity
Medium Velocity impact splatters- Slower than a bullet wound but faster then gravity
High Velocity impact splatters- Only created by bullets or fast machinery
drop patterns
characteristic patterns present when blood drips into standing, wet blood
Blood analysis definitions
After 1970's instead of the impact it is measured by the speed of the weapon that sent the blood drops flying
Accompanying drop- a small drop produced as a by-product of drop formation
Void- an abscence of blood in an otherwise continuous bloodstain or bloodstain pattern
Target- A surface onto which blood has been deposited
Insect Stain- A blood stain resulting from insect activity
Blood types
transfer pattern
There are 4 blood types A B AB and O and all of these blood types can be positive or negative, and also certain blood types match with of blood types
pattern created when a wet, bloody object comes in contact with a target surface leaving a pattern that has the features of an object making it useful for identifying the object
Conclusion
History of Blood Spatter
https://quizlet.com/5050271/blood-spatter-definitions-flash-cards/
plasma
plasma the yellow liquid component of blood in which the blood cells in whole blood would normally be suspended
The first book used to study blood spatter is titled "Concerning the origin, shape, direction and distribution of the blood stains following head wounds caused by blows" and was published in 1895 by Dr. Eduard Pietrowski.
Expansion of Bloodstain Analysis
Red Blood cells
Herbert Macdonell started this expansion of this by writing "Flight characteristics of human blood and stain patterns", in 1971. He was also the person who had begun training scientists in bloodstain analysis.
Blood spatter was not legal evidence until 1955.
In 1983 Macdonell and a few other scientists created the International association of bloodstain pattern analysis. After this the blood stain analysis field began to grow