FS Fall Final Review
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Transcript of FS Fall Final Review
![Page 1: FS Fall Final Review](https://reader030.fdocuments.in/reader030/viewer/2022033022/56812cd3550346895d919192/html5/thumbnails/1.jpg)
FS Fall Final Review
![Page 2: FS Fall Final Review](https://reader030.fdocuments.in/reader030/viewer/2022033022/56812cd3550346895d919192/html5/thumbnails/2.jpg)
Ch 1 and 2observations and CSI
• What factors affect our observations?
• How does the brain process information?
• How could you become a better eyewitness?
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Forensic investigators recognize, document, collect, and organize evidence left at the scene of a crime. Factors that affect observational skills such as emotion, perception and recall,time of day, level of interest, number of people…
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How does your brain work?
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Your brain…
• Filters (what is important, what you notice, your level of interest, who you are with, where you are….)
• Fills in gaps (you may think you saw it…)
• Applies previous knowledge (you sort out issues based on what you know)
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Direct vs Indirect
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Physical Evidence
![Page 8: FS Fall Final Review](https://reader030.fdocuments.in/reader030/viewer/2022033022/56812cd3550346895d919192/html5/thumbnails/8.jpg)
Trace
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Who does what?
• Who secures the scene and separates witnesses?
• Who takes measurements and notes location of evidence
• Who interviews the witnesses
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First Find, then
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Why secure the scene?
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Identify the regions of hair
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What part of the hair is shown?
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DNA?
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Human or NON-human Cuticle?
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Consistent? Dissimilar?Inconclusive?
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Is Hair CLASS or INDIVIDUAL evidence?
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Medulla
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Locard
• Every contact leaves a trace
• Duration
• Intensity
• Materials used
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Control?
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Fingerprint MinutiaeFingerprint Minutiae
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Fingerprints
• Alphonse BertillionAlphonse Bertillion– Anthropometry-use of body Anthropometry-use of body
measurements for identificationmeasurements for identification– Francis Galton-suggested 3 categories-Francis Galton-suggested 3 categories-
Arches, loops and whorlsArches, loops and whorls
• 1999 – 1999 – US v. Byron C. Mitchell-case US v. Byron C. Mitchell-case that provided 3 principles of fprintthat provided 3 principles of fprint
• 1. unique1. unique• 2. unchanging2. unchanging• 3. can be used to ID individuals3. can be used to ID individuals
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Kinds of Crime Scene Kinds of Crime Scene PrintsPrints•Patent /Visible prints – Patent /Visible prints –
– made by fingers touching a made by fingers touching a surface after ridges have surface after ridges have been in contact with a colored been in contact with a colored materials (blood, paint, etc.)materials (blood, paint, etc.)
•Plastic Prints – Plastic Prints – – ridge impressions left on a ridge impressions left on a
soft material (putty, wax, soft material (putty, wax, soap or dust)soap or dust)
• Latent/invisible prints – Latent/invisible prints – – caused by the transfer of caused by the transfer of
perspiration/oils on finger perspiration/oils on finger ridges to the surface of an ridges to the surface of an objectobject
![Page 25: FS Fall Final Review](https://reader030.fdocuments.in/reader030/viewer/2022033022/56812cd3550346895d919192/html5/thumbnails/25.jpg)
Identify each fingerprint pattern.
Right Hand
Left Hand
Left Hand
Right Hand
Right Hand
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How can we use these?
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What Can be learned from tire impressions?
• What type of impression is shown?
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Why is Chain of Custody so important?