1. Casts and Impressions

2. Impressions Types: Patent: visible (2D) Latent: not visible to eye
Plastic: 3-D, left in material
Class or individual evidence

3. Dental Impressions Bite marks = individual evidence
Dental patterns used to:
Identify remains
Identify suspects at crime scenes
DNA profile from saliva

4. Shoe Impressions (Shoeprints)
Size
Weight (depth of impression)
Shoe type (personality, lifestyle)
Activity (running, walking)
Unique features: debris, gait (walking habit), holes/cuts
# people, movements at crime scene

5. Preserving Footprint Evidence
Photographs
Lifting latent impressions
Luminol
Dusting
Electrostatic lifting and gel lifting
Casts
Plaster of Paris (mud)
Dental stone (snow)

6. Footwear Database

7. Tire Evidence Link a suspect or victim to crime scene
Reveal events that took place
Types:
Skid marks (braking suddenly)
Yaw marks (skid sideways in curved path)
Tire scrubs (during or after impact)

8. Tire Marks as Evidence Preservation: Examination: Photographs
Measurements
Examination:
Type of tire and make/model of car
How vehicle was driven

9. Casts Permanent impression of plastic prints left at a crime scene
Use Plaster of Paris or Dental Stone