Blood Spatter - Understanding the Clues

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 Violent crimes often
result in bloody scenes which are distracting. But the blood
itself, as well as the spatter patterns it forms, tells the
story of what happened.   Each drop of blood is
a paragraph in the story which was written by the laws of
physics and biochemistry.  Varying blood types at a crime
scene means that more than one person was involved and injured.
Size of the drops gives us a clue as to the velocity that the blood
reached prior to impact. This, in turn, is a clue to the nature of
the weapon used to inflict the injury. The shape of the blood drops
and their proportions tell the investigator what the trajectory was
of each drop. With this information we can begin to reconstruct the
crime, including movement of the victim, position of the suspect
and the number of times the victim was struck.


All we have to do is learn how to read the story. That's what
this lesson is about.


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    Grade: 10 to 12

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