BLOOD SPATTER ANALYSIS
1. blood spatter analysis was adopted in practical man- 1954 Sheppard
ner in US after what court case? case
2. blood spatter analysis can provide what information? -who shed blood?
-how did it get
where it was
found?
-what was the se-
quence of events
that led to this pat-
tern?
-origin of blood
stain
-type of instrument
causing stain
-direction from
which it struck vic-
tim
-relative position of
victim/assailant
-# of blows/gun
shots
-truthfulness of
suspects/witness-
es
3. what is blood held together by? surface tension
4. surface tension cohesive forces
that produce a sur-
face resistant to
penetration or sep-
aration
5. before a drop of blood can fall, what needs to happen? gravitational at-
traction for the
drop must exceed
surface tension
, BLOOD SPATTER ANALYSIS
*surface tension is
broken w/ energy
6. shape and size of blood drop depends on what four size of drop
factors? velocity
angle
type of surface hit
7. how fast does a drop of blood fall? increases speed
as it falls until it
hits terminal veloc-
ity (25 ft/ second)
8. when a drop of blood strikes at a right angle, spatter even circle around
pattern forms what shape? point of impact
9. when a drop of blood strikes at a smaller angle than oval pattern
90 degrees, what shape does it create? w/ narrow/pointed
end aiming in di-
rection of travel
10. these surfaces create small patterns of blood spatter smooth surfaces
like glass, tile, and
marble
11. when a drop of blood falls onto a hard surface, what small
can happen to the drops? secondary/satel-
lite droplet may
surround initial
circular stain
12. with drops that hit smooth surfaces at less than 90 point where they
degrees- secondary stains are elongated but tails of came from (NOT
satellite droplets point which direction? direction they are
traveling)
13. spatters can be produced by what mechanisms? stabbings
beatings
gunshots
arterial bleeds
1. blood spatter analysis was adopted in practical man- 1954 Sheppard
ner in US after what court case? case
2. blood spatter analysis can provide what information? -who shed blood?
-how did it get
where it was
found?
-what was the se-
quence of events
that led to this pat-
tern?
-origin of blood
stain
-type of instrument
causing stain
-direction from
which it struck vic-
tim
-relative position of
victim/assailant
-# of blows/gun
shots
-truthfulness of
suspects/witness-
es
3. what is blood held together by? surface tension
4. surface tension cohesive forces
that produce a sur-
face resistant to
penetration or sep-
aration
5. before a drop of blood can fall, what needs to happen? gravitational at-
traction for the
drop must exceed
surface tension
, BLOOD SPATTER ANALYSIS
*surface tension is
broken w/ energy
6. shape and size of blood drop depends on what four size of drop
factors? velocity
angle
type of surface hit
7. how fast does a drop of blood fall? increases speed
as it falls until it
hits terminal veloc-
ity (25 ft/ second)
8. when a drop of blood strikes at a right angle, spatter even circle around
pattern forms what shape? point of impact
9. when a drop of blood strikes at a smaller angle than oval pattern
90 degrees, what shape does it create? w/ narrow/pointed
end aiming in di-
rection of travel
10. these surfaces create small patterns of blood spatter smooth surfaces
like glass, tile, and
marble
11. when a drop of blood falls onto a hard surface, what small
can happen to the drops? secondary/satel-
lite droplet may
surround initial
circular stain
12. with drops that hit smooth surfaces at less than 90 point where they
degrees- secondary stains are elongated but tails of came from (NOT
satellite droplets point which direction? direction they are
traveling)
13. spatters can be produced by what mechanisms? stabbings
beatings
gunshots
arterial bleeds
