FS Fall Final Review - Humble Independent School District

FS Fall Final Review - Humble Independent School District

FS Fall Final Review Ch 1 and 2 observations and CSI What factors affect our observations?

How does the brain process information? How could you become a better eyewitness? 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 How does your brain work? 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) Direct vs Indirect Physical Evidence

Trace Who does what? Who secures the scene and separates

witnesses? Who takes measurements and notes location of evidence Who interviews the witnesses

First Find, then Why secure the scene? Identify the regions of hair

What part of the hair is shown? DNA?

Human or NON-human Cuticle? Consistent? Dissimilar? Inconclusive?

Is Hair CLASS or INDIVIDUAL evidence? Medulla

Locard

Every contact leaves a trace Duration Intensity

Materials used Control? Fingerprint Minutiae

Fingerprints Alphonse Bertillion Anthropometry-use of body measurements for identification

Francis Galton-suggested 3 categoriesArches, loops and whorls 1999 US v. Byron C. Mitchell-case that provided 3 principles of fprint 1. unique

2. unchanging 3. can be used to ID individuals Kinds of Crime Scene Patent /Visible prints Prints

made by fingers touching a surface after ridges have been in contact with a colored materials (blood, paint, etc.)

Plastic Prints ridge impressions left on a soft material (putty, wax, soap or dust)

Latent/invisible prints caused by the transfer of perspiration/oils on finger ridges to the surface of an object

Identify each fingerprint pattern. Right Hand

Left Hand Right Hand Right Hand

Left Hand How can we use these? What Can be learned from tire

impressions? What type of impression is shown? What can you learn from studying the gait (walking pattern)

Why is Chain of Custody so important?

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