Lecture 21: Glass : A Multitasking Class of Evidence. Introduction. Glass is an important class of associative evidence.
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Shards of glass from
An example of multitasking, associative evidence … it occurs in many crime types AND provides associative forensic information that can often
significantly help the on-scene investigation
Hit & Run
Annealed glass failure
Direction of Force
Conchoidal Stress Fractures on Edge of Radial Fracture
Right Angle Formed
By Chochoidal Fracture
And edge of Radial Fracture
Edge of Radial Fracture
Forensic Examination of Glass and Paint. Caddy, B. Ed.;
Taylor & Francis: London, 1999.
Angle of Impact of Bullet through Window
Perspective: Looking Down
onto Glass Shard Trail
A=Angle of Impact
Shot Sequence in Tempered Glass:
First Pellet Strike
Only strike that produces
Radial Fractures from 1st Pellet