ADMJ 1100 Lecture Notes - Lecture 9: Putty, Sole Markings, Trace Evidence
7 Jun 2018
School
Department
Course
Professor
CSI
Chapter 9 Lecture Slides
Impression Evidence
Shoe, tire, and tool mark prints
- Can be linked to known prints and impressions
- Evidence can lead to…
o Individualization (sole wear, tire wear)
o Point of entry and exit
o Brand
o Path suspect took
o Patterns
o Type of shoe
o Number of suspects
- Class characteristics (type of shoe and tire)
Collection of Impressions
- Photography (first)
o Midrange and examination quality close-up photos in case casting goes wrong
o Examination quality = camera on tripod and parallel with impression (true size
can be evaluated), impression needs to fill the frame, take photo from different
angles and lighting
o
- Casting (second)
o Gives life-like and actual molding of original
o Reproduces microscopic characteristics
o Used to use Plaster of Paris, now we use dental stone
▪ Can be used in hot or cold weather and in dirt, mud, sand, and snow
▪ Spray impression with hairspray to hold it in place (Snow Print Wax), keep
impression from collapsing when dental stone is poured in
o Cinderella Analysis: a worn shoe will have toe prints in the wear of the shoe to
determine if the shoe belongs to a person
Tool Marks are often a sign of forced entry
- Used to open a door or window
- Fragments of the tool (chipped paint, wood, and other trace evidence) should be
collected
Collection
- Should be sketched and photographed before casting or removal
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