Forensic investigation practicals

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  • Created by: aarafa11
  • Created on: 17-01-20 17:20
Type of evidence to recover
Marks/impressions, particles, biological, physical
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What evidence is part of marks/impression
Fingerprint, footwear marks, tool marks, tyre marks
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What evidence is part of particles
Glass, paint, fibres
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What evidence is part of Biological
DNA, body fluids
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What evidence is part of physical
clothing, weapons, ANY OBJECT
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why do you need to package exhibits
Protects personnel from injury or disease. Prevents cross contamination. Prevents damage to the item. Prevents degradation of evidence. Avoids loss of evidences' value
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Why does fingerprint and DNA evidence have a higher priority when collecting
They are easily damaged. They lead to individualisation of suspect or victim
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how may recovering evidence compromise it
Too many people at scene could destroy, not properly securing and preserving the scene, little use of protective clothing, releasing the scene to early, weather
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What does "chain of custody" mean
the chronological and careful documentation of evidence to establish its connection to an alleged crime
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What will the court look for when providing the evidence
the continuity and the trace-ability
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Why must you show the continuity and the trace-ability of an evidence
Because the judge can rule out the evidence for interruption of justice. the evidence can be altered
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Why is it important to recover control samples
to distinguish from BACKGROUND material (Constituent fibres from car seat). Make a comparison between known and questioned materials
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what type of packaging do you put hair and fibres in
tape, grip seal bags, TEB
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What is TEB
tamper evident bags
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what type of packaging do you put paint and glass in
6 pieces in ridged container then TEB. large pieces secured in a box, then in TEB
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what type of packaging do you put DRY clothes and shoes
Brown paper bag (BPB)
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what type of packaging do you put WET clothes
TEB and frozen. or. dried and BPB (can't secure the top)
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what type of packaging do you put digital harddrive
Antistatic bag
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what is important about antistatic bag
shield items that need to retain their electrostatic discharge protection
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what type of packaging do you put sharps, needles, knives
sharps/ weapons carrier
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what type of packaging do you put fingerprint items
secured in cardboard box, TEB
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what type of packaging do you put an item contaminated with accelerates
nylon bag, air-tight swan neck seal, TEB
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what type of packaging do you put tools
secured in cardboard box, TEB
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What is CJA
Criminal justice act 1967
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what is required in a CJA label
Description of item Where it was recovered from Whom it was seized from When it was recovered Whom it was recovered by Unique identifying mark (exhibit number) Officers initials and consecutive number
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What is important about the CJA label
Must be signed by each person who has responsibility for the exhibit to show chain of custody.
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what does it show if you fail to sustain the chain of custody
lead to serious questions regarding the authenticity and integrity of the evidence and examinations of it’
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where is the exhibits stored
in secure facilities at all times. so the conditions of the storage must be considered. Different types of exhibits must be stored in specific ways
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where do you store a biological swab
freeze as soon as possible
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where do you store a volatile substances
dry environment
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where do you store dry clothes
cool, dry enviroment
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where do you store a condom
freeze as soon as possible
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where do you store damp or wet item
Air dry (drying cabinet), brown paper bag
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What is the name of the outer layer of the hair
cuticle or (bark)
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what is a size of a hair
0.3 micrometer thick, 100 micrometres long, 10 micrometers across
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what is the medulla of a hair
dark region in the centre of the hair
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what are the 3 forms of medulla in HUMANS
fragmented, intermittent(interrupted), continuous
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what are the 3 forms of medulla in ANIMALS
lattice, uniserial, multiserial
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what are the 1st level detail in fingerprint
arch, loop, whorl
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what are type of arches are there in fingerprint
pain and tented
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what are type of loops are there in fingerprint
plain, nutant, converging
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what are type of whorl are there in fingerprint
plain, central pocket, elongated, accidental
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what are the second level detail in fingerprints
the ridge ending, bifurcation (ridge splits), dot inbetween 2 ridge ,
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Other cards in this set

Card 2

Front

What evidence is part of marks/impression

Back

Fingerprint, footwear marks, tool marks, tyre marks

Card 3

Front

What evidence is part of particles

Back

Preview of the front of card 3

Card 4

Front

What evidence is part of Biological

Back

Preview of the front of card 4

Card 5

Front

What evidence is part of physical

Back

Preview of the front of card 5
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