Gun Shot Residue (GSR)
Residues from explosion
of primer and charge
GSR
1
Gun Shot Residue (GSR)
Deposited near the discharged weapon
Hands and clothes of gun man
Clothes of target
Spreads out a distance of 1 m
2
Gun Shot Residue (GSR)
If the gun is pressed
against victim s head
GSR forced
into wound
Head wound
3
Gun Shot Residue (GSR)
How can we detect GSR?
Nitrite residues Nitrate
Nitrocellulose
Nitro glycerine
4
Griess Test
Test for nitrite
(X NO2) residues
3 inch Griess test results
5
Griess Test
May give false positive due to
Fertilizers
Urine
Cosmetics
Tobacco
6
Birmingham Six
Wrongfully convicted of carrying
out IRA pub bombings in 1974
Based in part on a Griess test
Conviction overturned in 1991
7
Sodium Rhodizonate
Test for lead, barium and
antimony from the primer
Sodium rhodizonate
8
Sodium Rhodizonate
Detection of barium, lead and antimony
Most probably GSR
9
SEM-EDX
SEM
See GSR particle
EDX
GSR particle
Tell what elements are present
10
1999
Jill Dando shot
on her doorstep
Jill Dando
11
Barry George
Arrested, charged
and convicted in 2001
One particle of GSR
found in his coat pocket
Barry George
12
Barry George
Deposited GSR only lasts for a few hours
GSR particle trapped in his coat pocket
Released on appeal in 2007
GSR evidence unreliable
13
GSR
GSR cannot be individualized
Not much variation within GSR
14
Types of GSR
1
Lead, barium, antimony
2
Lead, barium, antimony, aluminium
3
Lead, barium, antimony, tin
4
Lead, barium, calcium, tin, maybe antimony
5
Barium, calcium, silicon, tin, maybe lead
15
Summary
1
Comparison of bullet striations
2
Comparison of firing pin marks
3
Detection of GSR
16


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