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FSC239Y5 (400)
Lecture 3

FSC239Y5 Lecture Notes - Lecture 3: Hair Follicle, Stereo Microscope, Trace Evidence


Department
Forensic Science
Course Code
FSC239Y5
Professor
Wade Knaap
Lecture
3

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Lecture 03: Hair and Fibre Evidence
can be transferred between people, people and objects, or objects
Purpose
investigative or associative
Hair and Fibre Centre
collection of trace evidence
hair examination
fibre examination
textile damage assessment
approximately 80% of hairs/fibres are lost within first 4 hours after contact
factors affecting rate of loss:
type of textiles
length of hair/fibre
environment
handling/cleaning
Collection
objectives:
efficient collection of evidence
prevention of contamination
proper storage of evidence
methods:
taping
picking by eye/using a stereomicroscope
Proper Handling of Evidence
case items segregated into groups based on common source
sequence is chosen for taping items so contamination is minimized
items from different sources are taped in different rooms by personnel
different lab coat is worn for taping items from different sources
work area is cleaned before and after taping/mounting
examiners clothes are taped for control purposes
Hair and Fibre Examination
lots of microscopy to examine small fibres
hair examination objectives
identification (human/animal, body area, racial origin)
method of removal (pulled/fallen)
suitable for DNA analysis
chemical/physical treatment
comparison of known/unknown
fibre examination objectives
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