Lecture 1: Fire Analysis

Question 1

What is Forensic Science

Answer 1

application of science to law

Question 2

what is science

Answer 2

the systematic organization of information on a topic

Question 3

to be accepted in court evidence has to be:

Answer 3

testable and validated through founded science theories

Question 4

NAS 2009 Report

Answer 4

stated that forensic science is questionable and lacks peer reviewed papers

Question 5

SWG is:

Answer 5

scientific working groups that provided standards is doesnt exist now

Question 6

NIST & OSAC

Answer 6

it is the modern equivalent of SWG that is funded by the government proving standards and resources for the forensics community

Question 7

OSAC process

Answer 7

1 Terminology
2 Validation standards
3 Quality Standards
4 Collection & Storage
5 Notes Reports and Testimony Standards

Question 8

Ballistics

Answer 8

study of an objects flight study of firearms

Question 9

hand gun

Answer 9

one handed gun (ie revolver, semiautomatic)

Question 10

Why is it important to keep up with firearm news

Answer 10

It can help you identify new weapons and modifying weapons trends

Question 11

revolvers

Answer 11

revolving cylinder, swings out to load & unload, cocks hammer as it revolves

Question 12

semi-automatic

Answer 12

magazine with spring loaded bullets, one bullet per trigger

Question 13

squib round

Answer 13

where the bullet gets stuck within the barrel and could possibly explode

Question 14

single action

Answer 14

hammer is cocked each time

Question 14

double action

Answer 14

the gun will cock itself

Question 15

rilfes

Answer 15

one bullet per trigger, expel cartridge, reload, cock

Question 15

why do squib rounds happen

Answer 15

there might not have been enough gun powder in homemade bullets

Question 16

bolt action rifles uses _____ to cock and unload

Answer 16

a lever

Question 17

semi-automatic rifle

Answer 17

when firing expels cartridge

Question 18

automatic

Answer 18

machine gun

Question 19

shot gun

Answer 19

smooth barrel, can fire shots or slugs

Question 20

what is choke

Answer 20

when the end of the barrel gets smaller to get less range

Question 21

diameter is gauge which is measured by

Answer 21

number of lead ball that will amount to the weight of 1 lead ball that is the diameter of the gun

Question 22

what is rifling

Answer 22

spiraling on the inside of the barrel it is a class characteristics

Question 23

Broach rifling is

Answer 23

a large steel rod with spaced cutting rings which is inserted into the barrel and slowly turned

Question 23

button rifling

Answer 23

steel plug forced in barrel at a high pressure and polishes at the same time

Question 24

hammer rifling

Answer 24

bigger barrel with steel mandrel in the barrel then the barrel is hammered into the mandrel

Question 25

what is seen in hammer rifling

Answer 25

polygonal rifling

Question 26

what is bore diameter

Answer 26

it is the diameter between the lands

Question 27

what is caliber

Answer 27

is the approximate bore diameter (not exact)

Question 28

what kind of ammunition do handguns and rifles use

Answer 28

uses single projectile with propellant and primer

Question 29

what kind of ammunition do shotguns use

Answer 29

they use shots/pellets held together by wadding then shot with propellant and primer

Question 30

Lead alloy bullets

Answer 30

fully lead bullet with small amounts of other metals

Question 31

fully jacketed bullets

Answer 31

has a lead core with either copper/nickel/steel wrapping

Question 32

semi-jacketed bullets

Answer 32

like fully jacketed but the tip is left exposed, allows for mushrooming

Question 33

what is mushrooming

Answer 33

where the tip of the bullet expands outward when target is hit, causes more damage

Question 34

what is propellant made out of

Answer 34

made out of smokeless gun powder which is made out of nitrocellulose + stabilizers

Question 35

primer is a

Answer 35

small metal cup (percussive sensitive material) is struck by firing pin igniting lead, antimony, barium