1 / 32

ASISTM Project Forensic Investigations

annabel
Télécharger la présentation

ASISTM Project Forensic Investigations

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

    1. Fingerprinting ASISTM Project Forensic Investigations

    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.

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

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

    8. Loop

    9. Whorl

    10. Arch

    11. Minutiae - fine detail

    12. Minutiae Patterns

    13. Example

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

    15. Sweat pores

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

    17. Twins

    18. Twins Fingerprints The minutiae or fine details of identical twins fingerprints are different.

    19. Twins - minutiae

    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

    22. An easy way to take a fingerprint -2

    23. An easy way to take a fingerprint -3

    24. Brushing for a fingerprint at a crime scene

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

    26. Visible fingerprints on a door

    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.

More Related