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Footwear Evidence. Summary. What is footwear evidence? How is it involved in crime scenes? How is it collected? How is it analyzed?. Footwear Evidence. What is footwear evidence?. Different shoes will leave behind prints of different sizes and patterns. . Footwear Evidence.

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Presentation Transcript
summary
Summary
  • What is footwear evidence?
  • How is it involved in crime scenes?
  • How is it collected?
  • How is it analyzed?
slide3

Footwear Evidence

What is footwear evidence?

Different shoes will leave behind prints of different sizes and patterns.

slide4

Footwear Evidence

Three different types of shoe prints:

  • Three dimensional impression
    • Shoeprint made in soft material (dirt, snow)
    • Requires making a cast of the print
  • Composition of dirt or snow will determine the detail of the impression.
slide5

Footwear Evidence

Three different types of shoe prints:

  • Two dimensional print (visible)
    • Dirt or other material picked up by shoe and deposited onto flat, hard surface.
  • Variety of surfaces and materials deposited makes recovery of these prints complex.
slide6

Footwear Evidence

Three different types of shoe prints:

  • Two dimensional print (latent)
    • Can leave behind barely visible dust
    • Can leave impression in polish/wax/dust
slide7

Footwear Evidence

Three different types of shoe prints:

  • Two dimensional print (latent)
    • Can leave behind barely visible dust
    • Can leave impression in polish/wax/dust
slide8

Footwear Evidence

How are shoe prints evidence?

  • Most suspects wear shoes.
  • Footprints are always left, it is whether they can be located and differentiated from other prints.

Burglar

Shoes

slide9

Footwear Evidence

What information can shoe prints provide?

  • Link suspect or victim to scenes
  • Link two crime scenes

Location of prints can:

  • Lead to more evidence
  • Refute alibis
  • Gait or Tracking information?
slide11

Footwear Evidence > Collection

Recovery of Footwear evidence

  • Due to numerous nuances, all shoeprints should be recovered from the scene.
  • Scene should be controlled to prevent destruction of evidence.
slide12

Footwear Evidence > Collection

Recovery of Footwear evidence

  • Some prints can be visualized by darkening a room and using a bright light at a low angle.
  • Footprints should be documented:

Location recorded and photographed

slide13

Footwear Evidence > Collection

Recovery of Footwear evidence

  • Objects with footprints should be removed if possible (paper, glass)
  • If can’t be removed, an examination quality photo should be taken.

Ruler: allows for enlargement to real size

slide14

Footwear Evidence > Collection

After photo, 2-D print can be lifted:

Electrostatic Lifting:

  • A charge is used to lift dry materials from surface to black film.
  • Lift provides more contrast
  • Non-destructive
  • Photographed for evidence
slide15

Footwear Evidence > Collection

After photo, 2-D print can be lifted:

Dusting:

  • Fingerprint powder can visualize print
  • Lifted with adhesive or gelatin
  • Photographed for evidence
slide16

Footwear Evidence > Collection

3-D impression can be highlighted

Spraying with colored wax spray

slide17

Footwear Evidence > Collection

3-D impression should be cast

  • Cast picks up detail; is durable
  • Cast after photo
  • Use dental stone
slide18

Footwear Evidence > Collection

Enhancement Methods

If footprint is made of blood, TMB or other color changing reagents can help visualize.

slide19

Footwear Evidence > Analysis

Analysis of Footwear Evidence:

Class Characteristics can be used to eliminate a suspected shoe or suggest a shoe could have made the impression.

  • Size
  • Pattern

Suspect shoe or test impressions compared.

slide20

Footwear Evidence > Analysis

  • Individual Characteristics can be used to identify an exact shoe.

Analysis of Footwear Evidence:

  • However, these can change over time.