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 PresentationTRANSCRIPT
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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