Gun Shot Residue

Question 1

what are the main components of GSR?

Answer 1

barium, lead, and antimony

Question 2

T/F: you can find GSR on the shooters hands

Answer 2

true

Question 3

What are points of interest for GSR?

Answer 3

hands, hair, face, large objects (ie cars), clothing etc.

Question 4

Where is the Latent Forensic kit made? What does it include?

Answer 4

Canada by RCMP, Canadian forms (instructions for collection and lab submission forms)

Question 5

T/F: you will always find all three barium, antimony and lead in GSR.

Answer 5

False, you may find a mixture of 2 or all three in unequal amounts.

Question 6

What are characteristics of GSR?

Answer 6

Pb, Be, Sb

Question 7

what is consistent with GSR?

Answer 7

Pb/Be, or Be/Sb, or Pb/Sb

Question 8

what kind of components are analyzed in scanning electron microscopy and energy dispersive spectroscopy?

Answer 8

inorganic compounds

Question 9

What is offence level (III)?

Answer 9

did the POI shoot the victim

Question 10

what is activity level (II)?

Answer 10

did the POI discharge a firearm?

Question 11

What is Source level (I)

Answer 11

is the trace arising from the POI hands GSR?

Question 12

what are some environmental sources of GSR that are not from GSR?

Answer 12

Brake pads, fireworks, nail guns, matches and, exploded airbags

Question 13

With the survey of GSR prevalence on clothing what offences did they use to examine the garments?

Answer 13

non-firearm offences

Question 14

what percentage of garments contained Pb/Sb/Ba?

Answer 14

2%

Question 15

what percentage of garments had no particles whatsoever?

Answer 15

50%

Question 16

what is the probability of finding one 3-component particle on clothing by chance?

Answer 16

0.01

Question 17

the initial discharge of of a firearm results in the _____ of GSR particles onto surfaces in near proximity

Answer 17

direct deposition.

Question 18

GSR may be transfered to another surface by what?

Answer 18

a secondary transfer

Question 19

what percentage of officers had at least one GSR particle present?

Answer 19

10%

Question 20

in the simulated arrest situation being used to investigate GSR tansfer what was the probability of particle transfer

Answer 20

25%

Question 21

how many GSR particles are typically found after firing a gun?

Answer 21

0-3000 (generally on the lower end)

Question 22

what kind of gun will result in less characteristic GSR particles?

Answer 22

shot guns

Question 23

for shot guns where are you likely to see GSR?

Answer 23

supporting hand, and in the crook of the supporting arm

Question 24

where are you likely to find GSR from an automatic weapon?

Answer 24

both hands

Question 25

T/F: Automatic rifles make more GSR than revolvers and pistols

Answer 25

false there will be less particles found for automatic weapons

Question 26

how time sensitive is the GSR sample collection?

Answer 26

there will be rapid loss in the first few hours

Question 27

T/F: the guns do not effect GSR persistance.

Answer 27

true

Question 28

what types of material were used to assess the collection efficiency of gunshot residues?

Answer 28

cotton, worn cotton, leather, wool/vicose/acrylic

Question 29

T/F it is more common to get characteristic paraticles on gun shot residue?

Answer 29

false

Question 30

what kind of fabric has greater persistance of GSR than other fabrics?

Answer 30

leather

Question 31

what fabric has the greatest shedability rate?

Answer 31

cotton