Note 2 Bullets to Guns It is extremely difficult to convict someone of a murder without possession of the murder weapon Matching a bullet with a gun is essential in most cases of shooting Striations on bullets ID: 170658
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Slide1
Ballistic Analysis
Note #2Slide2
Bullets to Guns
It is extremely difficult to convict someone of a murder without possession of the murder weapon
Matching a bullet with a gun is essential in most cases of shooting
Striations on bulletsImpressions on cartridge casesSlide3
Striation
Bullets become
scarred
by rifling as they travel down the barrel of a
gun
No two rifle barrels have identical striated markingsSlide4
StriationsSlide5Slide6
Matching Procedure
Fire bullets from a suspected weapon
With the aid of a comparison microscope, compare these “test fires” to the suspected bullets
Striations must be identical for a positive match Slide7
Comparison Microscope
Two scopes in one fieldSlide8Slide9Slide10
Cartridge Cases
The weapon’s firing and loading mechanisms impress the shell with markings
The impression of firing pin into the primer
Other surface markings on cartridge caseThe markings on the shell can be compared to determine the suspected weaponSlide11
Impression on PrimersSlide12Slide13
Markings on the Cartridge Cases
https://www.youtube.com/watch?v=sBKJZTkbypo&feature=player_embeddedSlide14
Other Information from Ballistic Analysis
Gunpowder: assessment of the distance of weapon and wound up to 4 feet
Effects on target: type of firearms
Primer residue on the hand: identification of the shooterSerial number of the firearm: identification of the weapon