Bloodstain Pattern Analysis Flashcards Preview

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Flashcards in Bloodstain Pattern Analysis Deck (26):
1

satellite spatter

blood spatter around a parent stain; droplets pointed ends face direction of travel

2

angle of impact

the angle of the source of the blood to the surface where it was deposited

3

impact spatter

when an object makes forceful contact with a source of blood, projecting droplets outward

4

forward spatter

travels away from source in same direction as force

5

back spatter

directed back toward the source of the force

6

low velocity spatter

5 feet per second or less, drops with diameters greater than 4mm

7

medium velocity spatter

5-25 feet per second, drops diameter 1-4mm

8

high velocity spatter

100 feet per second or more, drop diameter less than 1mm

9

area of convergence

area on a two dimensional plane where lines traced through the long axis of several individual bloodstains meet

10

area of origin

location in three dimensional space from which blood that produced a bloodstain originated. area of convergence and angle of impact used

11

cast-off

created when blood is flung from a blood-bearing object in motion onto a surface

12

arterial spray

caused by spurts that resulted from blood exiting under pressure from an arterial injury

13

expirated blood pattern

created by blood that is expelled out of the mouth nose or respiratory system as a result of air pressure and/or airflow

14

void

an area within a deposited spatter pattern that is clear of spatter caused by an object or person's blocking the area at the time of spatters deposition

15

transfer pattern

when a surface that carries wet blood comes into contact with a second surface. imprints from original surface may be observed

16

flow

formed by the movement of a small or large amount of blood as a result of gravity

17

skeletonization

process by which the edges of a bloodstain dry to the surface in a specific period of time. will remain apparent even after the rest of the bloodstain has been disturbed

18

drop trail pattern

formed by the dripping of blood by a moving surface or person in a recognizable pathway separate from other patters

19

gunshot spatter

can consist of both forward and backward spatter from exit and entrance wounds

20

pools

formed when large amounts of blood collect

21

surface texture

important in the interpretation of bloodstain patterns. round v irregular

22

string method

1. find the area of convergence
2. place pole as an axis coming from area of convergence
3. attach one end of string to each droplet, use protractor to get determined angle, attach other end to pole
4. view area or origin where strings appear to meet

23

two methods of scaling patterns

1. grid method: set up grid using string and stakes
2. perimeter ruler method: rectangluar border of rulers

24

overall documentation

pictures and sketches, orientation of the pattern to the scene

25

medium-range documentation

pictures and sketches, whole pattern and relationships between individual stains

26

close-range documentaion

pictures and sketches, dimensions of each individual stain, with scale