FORENSIC SCIENCE: An Introduction by Richard Saferstein
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Structural variations and irregularities
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Individualization
FORENSIC SCIENCE: An Introduction by Richard Saferstein
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inner surface
each gun
FORENSIC SCIENCE: An Introduction by Richard Saferstein
peculiar to
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microscopic drill marks
FORENSIC SCIENCE: An Introduction by Richard Saferstein
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rifling
grooves
lands
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diameter
caliber
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Land
Diameter
Caliber
Groove
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Striations
fine lines found in
the interior of the barrel
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inner surface
striation markings
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single most important tool
Two bullets
compared simultaneously
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smooth barrel
shotgun has a
diameter of the shotgun barrel
gauge
higher the gauge
smaller the barrel’s diameter
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firing pin
primer
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impressed
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firing pin breechblock
ejector
distinctive signature
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impressed
firing pin
cartridge case
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distinctive markings
 Ejector
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 Extractor
 Magazine
FORENSIC SCIENCE: An Introduction by Richard Saferstein
clip
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computerized imaging
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comparison of the
powder-residue pattern
against test patterns
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star-shaped
(stellate) tear pattern
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bullet wipe
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Figure 8-16A
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Figure 8-16B
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Figure 8-16C
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Figure 8-16D
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Figure 8-17
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Figure 8-18
(a)
FORENSIC SCIENCE: An Introduction by Richard Saferstein
(b)
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Figure 8-20A
www.evidentcrimescene.com
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Figure 8-20B
www.evidentcrimescene.com
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test
FORENSIC SCIENCE: An Introduction by Richard Saferstein
Greiss
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antimony
barium
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National Integrated Ballistics
Information Network (NIBIN)
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examiner
FORENSIC SCIENCE: An Introduction by Richard Saferstein
forensic
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serial number
Restoration of serial numbers is possible
through chemical etching
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guard
the grip
edge of the trigger
checkered portions of
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the bullet
FORENSIC SCIENCE: An Introduction by Richard Saferstein
protect
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tool mark
impression
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imperfections
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comparison microscope
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
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shoe tire
FORENSIC SCIENCE: An Introduction by Richard Saferstein
fabric
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chemical enhancement
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comparison
FORENSIC SCIENCE: An Introduction by Richard Saferstein
points of
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bite mark
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