Fingerprinting

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Author:
minna528
ID:
24248
Filename:
Fingerprinting
Updated:
2010-06-20 11:36:30
Tags:
fingerprint
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Description:
Fingerprint testimony
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  1. Accidental Whorl
  2. Double loop whorl
  3. Plain arch
  4. Tented arch

  5. Left-
    Right-
    Loop

    Left hand- Ulnar loop

    Right hand-Radial loop
  6. Central Pocket whorl

  7. Left-
    Right-
    Loop

    Left-Radial loop

    Right-Ulnar loop
  8. Plain whorl
  9. Ridge ending
    ridge that ends abruptly
  10. bifurcation
    Single ridge that divides into two ridges
  11. Lake or enclosure
    single ridge that bifurcates and reunites shortyly afterwards to continue as a single ridge
  12. short ridge
    island ridge
    independent ridge
    a ridge that commences, travels a short distance then ends
  13. dot
    an idependent ridge with approximatley equal length and width
  14. spur
    a bifurcation with a short ridge branching off a longer ridge
  15. Cross over or bridge
    a short ridge that runs between two parallel ridges
  16. what is AFIS
    • AFIS is the automated Fingerprint identification system-
    • Capable of reading, classifying, matching and storing fingerprints

    NEVER MAKES A MATCH-ONLY LISTS POSSIBILITIES
  17. How does AFIS work?
    uses computer algorithms to mark all minutia points and deltas to find POSSIBLE matches
  18. Minutiae
    Characteristics of ridges
  19. What are fingerprints
    • The deposition of a friction ridge pattern from the dirt and oils of the hand/fingers
    • 98% water
    • 2%- oil, grease, salts, and amino acids
  20. Uniqueness of fingerprints
    To date no two fingerprints from different individuals have ever been found to match

    Fingerprint analysis has been studied for over 100 years and AFIS routinely compares hundreds of thousands of prints
  21. What is the percentage of loop patterns
    65%
  22. What is the percentage of Whorl patterns?
    30%
  23. What is the percentage of arch patterns?
    5%
  24. Ridge identification is based on ____differnt ridge characteristics.
    • 15
    • ridge endings
    • bifurcations
    • short ridges
    • trifurcations
    • crossings
    • changeovers
    • ridge pinch
    • loops
    • ect.
  25. Fingerprint identification is based on:
    Finding agreement of individual characteristics--with no unexplainable dissimilarities
  26. Latent prints
    invisible prints created by the deposition of normal body secretions
  27. Patent prints
    Causes by the deposition of contaminants (bloody, greasy fingermarks) that are visible to the naked eye
  28. Plastic prints
    impressions where a print has been deposited in a soft surface (such as wax)
  29. Level 1 details
    friction ridge flow and general morphology information
  30. level 2 details
    individual friction ridge paths and friction ridge events (bifurcations, ridge endings and dots)
  31. level 3 details
    friction ridge dimensional attributes (e.g width, edge shapes, pores)
  32. ACE-V

    Analysis
    the assessment of an impression to determine the existence of discrepancies, dissimilarities or similarities
  33. ACE-V

    Comparison
    The observation of 2 or more impressions to determine the existence of discrepancies, dissimilarities or similarities
  34. ACE-V

    Evaluation
    Examiner assesses the value of details observed during the analysis and the comparison steps and reaches a conclusion
  35. ACE-V

    verifications
    A review and independent analysis of the conclusion of another examiner

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