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ASISTM Project Forensic Investigations

ASISTM Project Forensic Investigations. Fingerprinting. What are fingerprints?. On the fingers and palms of the hands and the toes and soles of the feet the skin is covered with friction ridges. Photograph Paul Ricketts, 2006. Why do we have friction ridges? .

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ASISTM Project Forensic Investigations

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  1. ASISTM ProjectForensic Investigations Fingerprinting

  2. What are fingerprints? On the fingers and palms of the hands and the toes and soles of the feet the skin is covered with friction ridges.

  3. Photograph Paul Ricketts, 2006

  4. Why do we have friction ridges? Friction ridgesare used to increase grip and the sense of touch.

  5. Photograph Paul Ricketts, 2006

  6. Friction ridges on the feet Photograph Paul Ricketts, 2006

  7. Friction Ridge Patterns There are 3 main friction ridge patterns: • Loops - most common • Whorls • Arches - least common

  8. Loop Image courtesy J. Dook, 2006

  9. Whorl Image courtesy R. Henderson, 2006

  10. Arch Image courtesy J. Dook, 2006

  11. Minutiae - fine detail Image courtesy R. Henderson, 2006

  12. Minutiae Patterns Image courtesy J. Dook, 2006

  13. Example Image courtesy J. Dook, 2006

  14. Sweat Pores It is possible to see small white “dots” on the friction ridges - the white dots are sweat pores.

  15. Sweat pores Image courtesy C. Henderson, 2006

  16. Identical Fingerprints? No two fingers have ever been found to possess completely identical friction ridge patterns.

  17. Twins CH: Left middle finger RH: Left middle finger The boys both have a LOOP pattern but one of the twins appears to have cut his finger at some stage. Image courtesy R. Henderson & C. Henderson, 2006

  18. Twins Fingerprints The minutiae or fine details of identical twin’s fingerprints are different.

  19. Image courtesy R. Henderson & C. Henderson, 2006 Twins - minutiae RH: Left middle finger CH: Left middle finger

  20. How to take a fingerprint An easy way is to use a pencil: 1) Rub an area on a piece of paper with a pencil.  2) Then rub your finger over the graphite on the paper.  • Next, apply a small piece of sticky tape to the finger, lift and place the tape on the sheet of paper. • Make sure you clearly indicate from which finger the sample is from.

  21. An easy way to take a fingerprint Photograph Paul Ricketts, 2006

  22. An easy way to take a fingerprint -2 Photograph Paul Ricketts, 2006

  23. An easy way to take a fingerprint -3 Photograph Paul Ricketts, 2006

  24. Brushing for a fingerprint at a crime scene Image courtesy J.Dook, 2006

  25. Finding Fingerprints Some fingerprints are obvious - these are called visible prints.

  26. Visible fingerprints on a door Photograph Paul Ricketts, 2006

  27. Finding Fingerprints Some fingerprints are NOT obvious - these are called latent prints.

  28. How do you find latent prints? Certain chemicals attach to substances that have been excreted by the sweat pores.

  29. Using superglue

  30. Using iodine

  31. Using ninhydrin

  32. References Images • Fingerprints of J. Dook, R. Henderson and C. Henderson were taken using a pencil as described on Slide 17. The prints were then scanned into Adobe Photoshop at a resolution of 1200dpi. • J. Dook is the hand and foot model. • Slide 18 image taken of Police Constable Darren Fisher by J. Dook at the Joondalup Police Academy, November 2005. • All other photography by Paul Ricketts, DUIT Multimedia, the University of Western Australia. • Graphic design of slides by Trevor Hutchison, DUIT Multimedia, the University of Western Australia.

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