Firearm: Identification of Weapon
Firearms Identification
- A discipline mainly concerned with determining whether a bullet or cartridge was fired by a particular weapon.
Crime (exhibit) bullet:
- The bullet found in body or crime scene
- Test under microscope with test bullet from suspected weapon.
Determined by –
- Primary and secondary marking.
- The appearance of the wound.
Primary Marking:
- Class Characteristics
- Different gun manufacturers use different rifling techniques
- These techniques impart the class characteristics of a bullet
- Number of lands and grooves
- Width of lands and grooves
- Depth of lands and grooves -Pitch
- Twist
Secondary Marking
- Individual/accidental marking
- Bullet fingerprint
- A cross section of a gun barrel will show small grooves or striations all along the lands and grooves (machine markings)
- These are created when the barrel is rifled. No two gun barrels have the exact same markings.
- Irregularities on the inner surface of barrel due to accidental manufacturing defect’ or metallic fouling( sticking of particles of prior fired bullet.)
Note:
- Presence of spiral grooves in the barrel of weapon is referred to as Rifling
- Empty cartridge case is ejected after firing in pistol.
- Compressed air is used to fire lead slugs in air rifle
Exam Important
- Firearm detection determined by –
- Primary and secondary marking.
- The appearance of the wound.
- Presence of spiral grooves in the barrel of weapon is referred to as Rifling
- Empty cartridge case is ejected after firing in pistol.
- Compressed air is used to fire lead slugs in air rifle
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