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ASISTM Project Forensic Investigations

ASISTM Project Forensic Investigations. Impressions. Shoeprints. The physical contact between the shoe and the surface results in a transfer of the individual characteristics of the shoe. Shoes prints are often used to prove that suspect was present at a crime scene.

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ASISTM Project Forensic Investigations

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  1. ASISTM ProjectForensic Investigations Impressions

  2. Shoeprints The physical contact between the shoe and the surface results in a transfer of the individual characteristics of the shoe. Shoes prints are often used to prove that suspect was present at a crime scene.

  3. 3-dimensional impressions Footwear impressions are pressed into a soft surface such as mud. The impression is influenced by the weight of the person and the type of surface.

  4. Casting a 3-dimensional impression Photography Paul Ricketts, 2006

  5. Sports Shoes Photography Paul Ricketts, 2006

  6. Boots Photography Paul Ricketts, 2006

  7. Lady’s shoes Photography Paul Ricketts, 2006

  8. Using Alginate to make an impression 1 - alginate powder Photography Paul Ricketts, 2006 2 - pour the alginate into a plastic bag 3 - about 1/3 of a bag

  9. 4- add water 5 - squish the powder and water 7 - cut a small hole at a corner of the bag with scissors 6 - thoroughly mix Photography Paul Ricketts, 2006

  10. 8 - squeeze out the alginate onto the impression. Work quickly as alginate dries very fast. 9 - carefully pat into place 10 - the alginate changes colour when dry - carefully lift from the impression Photography Paul Ricketts, 2006

  11. The finished impression 10 - wash away as much dirt as possible Pict of finished impression - to do Photography Paul Ricketts, 2006

  12. 2-dimensional impressions 2-dimensional impressions occur when an image of the print is left on the surface. Some 2-dimensional impressions are highly visible – muddy footprints on a cleaned floor – while others are latent or invisible.

  13. 2-dimensional impression: Blood Photography Paul Ricketts, 2006

  14. Latent 2-dimensional impression: luminol Photography Paul Ricketts, 2006

  15. Other impressions Casts can be taken of the impressions of other objects. Eg, tyre tread

  16. Tyre tread Photography Paul Ricketts, 2006

  17. Tyre tread on ground Photography Paul Ricketts, 2006

  18. References Images • All photography by Paul Ricketts, DUIT Multimedia, the University of Western Australia. • J. Baines is the model for the sequence of photographs showing taking a shoeprint impression using Alginate. • Shoes supplied by J. Dook. • Graphic design of slides by Trevor Hutchison, DUIT Multimedia, the University of Western Australia.

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