Bloodstain Pattern Flashcards
What is Bloodstain Pattern Analysis
An in depth evaluation of the physical bloodstains found in a given scene.
three areas BPA is divided into
Pattern recognition and classification
The spatial origin or orientation of
particular stains
Patterns when created as well as aspects
of alteration of the stain as a function of
environmental exposure.
The human body contains approximately ______ of blood________ females, which is 8% of your total body weight
- 5 – 6 liters
- (4 – 5 liters)
_____%total blood loss (internally / externally) is required to cause shock, can lead to death
40
A blood loss of approximately___ liters causes incapacitation
1.5
T/F
Blood is not effected by the consumption of alcohol when interpreting bloodstain patterns
True
What Can Blood Evidence Tell Us
- Directionality
- Angle of Impact
- Area of Origin of Bloodshed
- Minimum Number of Bloodletting
Events - Sequence of Events
Directionality
The direction from which the blood
droplet originated.
Angle of Impact
A blood droplet is spherical in shape
while airborne.
A blood droplet is _______in shape
while airborne.
spherical
Angle of Impact
When blood impacts a surface at different angles, the shape changes
Area of Origin
The three-dimensional location from which spatter originated
Mist Pattern
resulting from blood reduced to a spray of micro-drops as a result of the force applied
example gunshot, power tool
Cast-off Pattern
- resulting from blood drops released from an object due to its motion.
- Hand, Hair, Dog tail
Drip Pattern
- resulting from a liquid that dripped into
another liquid, - at least one of which was blood.
Drip Stain
A bloodstain resulting from a falling drop
that formed due to gravity.
Drip Trail
resulting from the movement of a source of drip stains between two points.
Expiration Pattern
resulting from blood forced by airflow out of the nose, mouth, or a wound.
Flow Pattern
resulting from the movement of a volume of blood on a surface due to gravity or movement of the target.
Forward Spatter Pattern
resulting from blood drops that traveled in the same direction as the impact force.
Perimeter Stain
altered stain that consists of the peripheral characteristics of the original stain.
Pool
resulting from an accumulation of liquid blood on a surface
Projected Pattern
resulting from the ejection of a volume of blood under pressure.
Spatter Stain
from a blood drop dispersed through the air due to an external force applied to a source of liquid blood
