Impression Evidence Flashcards
1
Q
types of footwear evidence
A
- Impressions (3D negatives)
- Prints (2D positives)
2
Q
Info from footwear impressions
A
- ID or eliminate suspects
- confirm alibis
- number of people
- gait characteristics - unreliable
3
Q
Processing footwear impressions
A
- locate using oblique lighting, electrostatic lifting, chemical development
- document using photography
4
Q
electrostatic lifting
A
- used for 2D footwear prints, lifts dust and dirt particles
5
Q
casting footwear impressions
A
- exothermic process
- reproduction of actual size and microscopic details
- captures wear patterns (non-individualized)
- captures accidental characteristic (individualized)
6
Q
SICAR
A
- shoeprint image capture and retrieval database
- used for comparisons
7
Q
Tire marks
A
- reflect tread design and dimensions
- duplicated by inking tread and running over paper
8
Q
Fabric Impressions
A
- pattern left behind
- not individualized, but the way it touches an object may be unique
9
Q
Bitemarks
A
- hard to photograph, change overtime
10
Q
PCAST 2016
A
- efforts to improve policies and practices
- “repeatable, reproducible and accurate”
- “reliably applied in practice”
- bitemarks have low validity
