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Forensic Science Ch 5
Terms in this set (15)
What characteristics makes hair a useful forensic tool?
1) The body loses hair constantly. 2) Hair catches on and clings to clothing, rugs, etc 3) Hair absorbs chemicals ingested by the person
What is the "morphology" of hair?
the form and structure of hair
How many hairs fall out during the average day?
Where is the medulla found?
On the interior of the hair
Where is the cuticle found?
On the outside of the hair shaft
Where in the hair are the pigment granules found?
In the cortex
If the cross section of a hair is found to be oval, you expect the hair to be...
What is the anagen stage?
The active growth stage of hair
How long does the anagen stage last?
Up to 5 years
At any given time, approximately how many hairs are found to be in the anagen stage?
What is the telogen stage?
The final phase when the follicle is ready to release the hair
How long does the telogen stage last?
List the advantages of using hair for drug testing
1. Hair is durable 2. It lasts a long time 3. It can give a history/timeline of drug use or poisoning
List the disadvantages of using hair for drug testing
1) Hair can pick up environmental pollutants, creating a false positive 2) Person can cut their hair, getting rid of evidence
If given a random hair, how can you tell if it's human or animal
Study the medullary index. You would need to examine the cuticle, thickness and color banding in order to tell if it's human or animal.
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