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Ballistic Analysis Ballistic Analysis

Ballistic Analysis - PowerPoint Presentation

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Uploaded On 2015-10-24

Ballistic Analysis - PPT Presentation

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

cases markings weapon bullets markings cases bullets weapon cartridge suspected firing shell impression primer ballistic microscope comparison striations identical gun murder analysis

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Presentation Transcript

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

StriationsSlide5
Slide6

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 fieldSlide8
Slide9
Slide10

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 PrimersSlide12
Slide13

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