CC100 Lecture Notes - Adenosine Triphosphate, Calliphoridae, Forensic Entomology
Document Summary
Whenever two objects come into contact with one another, there is an exchange of materials between them. Characteristics of a piece of evidence that place it with a particular group, but not with a unique source. Those characteristics that may distinguish the evidence from other evidence of the same group or class. Structural variations and irregularities caused by scratches,nicks,breaks,and wear may permit the criminalist to relate : A scratch or abrasion mark to a single tool. A tire track to a particular automobile. A harder object marks a softer one and imparts/transfers its microscopic irregularity to that object. The manufacture of a barrel requires impressing its inner surface with spiral grooves, a step known as rifling. Each will have the same : number of lands and grooves, the same approximate width and direction of twist. Fine lines found in the interior of the barrel.
