Grayce P. Storey
I. Objective:
The students will be able to:
1. define physical evidence.
2. discuss four common types of physical evidence.
3. discuss the manner in which physical evidence should be handled and why.
II. Vocabulary
1. fiber
2. physical evidence
3. contamination4. admissable
Definition:
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Physical evidence is any and all objects that can establish that a crime has been committed or can provide a linkbetween a crime and its victim(s).
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III. Common Types of Physical Evidence
blood, semen, saliva, documents, drugs, explosives, fibers, fingerprints, paint, glass, hair, impressions, powder, residue, soil and minerals, firearms, ammunition, serial numbers, petroleum products, etc.
IV. Manner in Which Physical Evidence Should be Handled to Prevent Contamination
A. Instruments for retrieving
1. plastic pill bottles with pressure lids
2. envelopes of various sizes
3. paper bags
B. Documentation
1. description and location of items
2. by whom it was discovered
3. how evidence packaged and marked
4. how evidence transported to lab
V. Lab Activity
A. Materials
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1. Hair
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a. microscope
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b. slide
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c. cover glassd. five (5) hair samplese. notebook
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2. Fiber
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a. microscope
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b. slide
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c. cover glassd. five (5) thread samplese. notebook
B. Procedures
1. Students will investigate all hair and fiber samples underthe microscope. They will also draw the hair and threadsamples in their notebooks.
C. Questions (to be answered in complete sentences)
1. What are the similarities in the hair (thread samplings)?
2. Describe the differences between the hair and thread.
3. How do you think these samplings may be used in a crimelab?