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Bloodstain Pattern Analysis (Types of Bloodstains (Passive (Pool, Flows,…
Bloodstain Pattern Analysis
Directionality
The tail on a droplet can indicate the angle of impact
The shape of a droplet can also be used to indicate path of travel
Grouping Bloodstains
Size
Can indicate the amount of force needed to produce a certain sized droplet
Shape
Can indicate the angle of impact
Location
Can indicate whether or not one or mroe events occured
Droplet Size and Force
Greater the force, the smaller the droplet size
High, medium, low velocity are the different mechanisms that cause certain types of droplet sizes and patterns
Types of Bloodstains
Passive
Pool
Flows
Splash
Drips
Impact
Caused by contact with an object
Transfer
Swipes
Wipes
Contact/pattern transfer
Caused by the transer of blood from a bloodied object onto another suface
Latent
Blood stains that are not visible to the naked eye
Projected
Caused by arterial spurts
Cast-off
Blood that is flung from an object covered in blood
Expirated
Blood that is blown due to high air pressure