CHE 107 Lecture Notes - Lecture 25: Homicide
11 Oct 2018
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Before any impression is moved or otherwise handled, it must be photographed (including a scale) to show all the observable details of the impression: shoe, tire, fabric. When shoe & tire marks are present at crime scene, preservation is best accomplished by photography & casting. If impression is on readily recoverable item, evidence is transported intact to lab: glass, paper, floor tile. Sufficient # of points of comparison or uniqueness of such points will support finding that both questioned & test impressions originated from one. New computer software & web sites may be able to assist in making shoe print & tire impression comparisons. Bite mark impressions on skin & foodstuffs have proven to be important evidence in a number of homicide & rape cases: the four ballistic regimes, interior ballistics: Deals w/ conversion of chemical energy from propellant to kinetic energy of projectile. Deals w/ motion of projectile in gun barrel: exterior ballistics:
