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Bullet Comparison and Identification (Identification (Physical…
Bullet Comparison and Identification
Identification
Physical Characteristics
Pattern Identification
Consecutive Matching Striae
AFTE Theory
Sufficient Agreement and Best Known Non-match
AFTE Range of Conclusions
Identification
Inconclusive
Elimination
Unsuitable for Comparison
Bullet Examination
Rifling in the barrel has unique microscopic characteristics
These characteristics mark the bearing surfaces of bullets
They are reproducible and identifiable with a particular firearm
Microscopic Procedures
Without Related Evidence
Comparison with new evidence submissions at a later time
Entry into digital image reference files
With Related Evidence
Elimination
Identification
Inconclusive
Without Related Firearm
Inter-comparison of all recovered bullets
Case Linkage
Reference files
IBIS
Casting
Mix components of casting material
Apply mixture to surface of fired bullet and allow to dry
Remove cast once hardened
Casts must be compared to other casts