Fingerprints

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  • Created by: Ashlee
  • Created on: 01-05-15 19:13
What are the components of fingerprints?
Ridge pattern, burification, ridge units, ridge ending, sweat pore, scars, ridge, furrow
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What are furrows?
Valleys or depressions between friction ridges
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What 2 processes would you use to compare fingerprints?
Suspect nomination and speculative searching
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What is suspect nomination?
Comparing fingerprints found at scene to specific person
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What is speculative searching?
Comparing fingerprints found at scene to entire database for match
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How many clarity details are there?
3
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What are the first levels of detail for fingerprints?
Ridge flow and pattern
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What is ridge flow?
Path and arrangement of friction ridges
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What are patterns in fingerprints?
Arrangement of ridges during foetal growth
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What are the second levels of detail for fingerprints?
Scars, ridge endings, permenent creases and burifications
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What are ridge endings?
Ridge that comes to a natural stop or finish
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What are burifications?
When a ridge splits into 2 and diverge to make room for it
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What are the third levels of detail for fingerprints?
Ridge unit shapes and relative positions of sweat pores
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What are the different types of volar pads?
Accidentals, twinned loops, composites, loops, whorls and arch
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What are accidentals?
Two or more deltas, possess characteristics common to all types, doesn't conform to any pattern
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What are twinned loops?
2 well defined loops, 2 deltas and sub-divided by ridge tracing
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What are composites?
Combination of patterns with 3 or more deltas
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What are loops?
1 or more ridges curve from one side and back over to same side
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What are arches?
Ridges from one side curve to the other
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What are whorls?
Re-curving ridge within inner area that is cut/touched, makes a complete circuit with 2 deltas
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What are 2 systems used to store fingerprints?
Fingerprint form database and crime scene mark database
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What are 3 checks to process fingermarks?
Manual comparison, Ident1 and ACE-V
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What is Ident1?
Database for holding, searching and comparing biometric info, used after arrested
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What is ACE-V?
Analysis, comparison, evaluation and verification
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Why use the 3 checks to process fingermarks?
ACPO requirements
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What analysis techniques could you use for fingermarks?
Sideways pressure distortion, downwards depositing pressure, matrix, clarity, substrate, developmental medium, other observations
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What is deposition pressure?
Downwards pressure, heavier = result in ridges appearing thicker and furrows narrow
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What is the matrix?
The substance deposited by fingermark and developed
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What is clarity?
The presence of detail - visual quality of ridge detail
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What is a substrate?
The surface in which the ridge detail is deposited
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What developmental mediums could you use for fingermarks?
Lifting, photographing, magna powder, aluminium powder, black powder
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What decides the developmental medium used on fingermarks?
Surface type
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What is streamlined forensic reporting?
Produces forensic evidence, preserves fairness and confidence, proportionate evidence according to needs of case, reduces costs, delays and bureacracy
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Other cards in this set

Card 2

Front

What are furrows?

Back

Valleys or depressions between friction ridges

Card 3

Front

What 2 processes would you use to compare fingerprints?

Back

Preview of the front of card 3

Card 4

Front

What is suspect nomination?

Back

Preview of the front of card 4

Card 5

Front

What is speculative searching?

Back

Preview of the front of card 5
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