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Ballistic Analysis Note #2

Ballistic Analysis

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Ballistic Analysis. 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 Impressions on c artridge c ases. Striation. - PowerPoint PPT Presentation

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Page 1: Ballistic Analysis

Ballistic AnalysisNote #2

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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• Impressions on cartridge cases

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Striation• Bullets become

scarred by rifling as they travel down the barrel of a gun

• No two rifle barrels have identical striated markings

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Striations

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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

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Comparison Microscope

Two scopes in one field

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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 case

• The markings on the shell can be compared to determine the suspected weapon

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Impression on Primers

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Markings on the Cartridge Cases

•https://www.youtube.com/watch?v=sBKJZTkbypo&feature=player_embedded

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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

shooter• Serial number of the firearm: identification of the

weapon