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Bullet Comparison and Determination
retrieved March, 2020
https…
Bullet Comparison and Determination
retrieved March, 2020
https://firearms-examiner.training.nij.gov/
Module 11
Identification
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Physical Characteristics
Individual characteristics Marks produced by the random imperfections or irregularities of tool surfaces.
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Pattern Identification
process of determining whether or not the striated toolmarks on two objects, such as fired bullets, correspond
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Bullet Examination
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Microscopic Procedures
- Review laboratory protocols
- Complete administrative requirements
- Follow laboratory safety protocols
- Determine the presence of trace evidence
Recovered Firearm Without
Related Evidence
- All firearms submitted to the laboratory should be test fired and the bullets recovered
Recovered Firearm With
Related Evidence
- test bullets from a recovered firearm should be performed according to laboratory protocol.
Evidence Without Related Firearm
- intercomparison of a number of recovered evidence bullets when no firearm was recovered should be performed according to laboratory protocol.
Case Linkage
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Bullets submitted to the laboratory are microscopically compared to all previous bullets of the appropriate caliber retained in physical files
Casting
- Bullet Surface Replication
Procedure
- several recognized brands of appropriate casting material for toolmarks, including Mikrosil, Coe-Flex, and Dip-Pak, among others