ballistic analysis
DESCRIPTION
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
Ballistic AnalysisNote #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 cartridge cases
Striation• Bullets become
scarred by rifling as they travel down the barrel of a gun
• No two rifle barrels have identical striated markings
Striations
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
Comparison Microscope
Two scopes in one field
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
Impression on Primers
Markings on the Cartridge Cases
•https://www.youtube.com/watch?v=sBKJZTkbypo&feature=player_embedded
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