Questions and Answers
What is a fiber (as it pertains to textiles)?
The smallest unit of a textile.
What is a textile?
Woven cloth or fabric.
Why might fibers be important in forensics?
They are often responsible for providing valuable clues as to who the attacker was in a crime.
How are fibers collected from a crime scene?
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Research a crime that involved fibers as evidence.
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How are fibers classified?
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Which of the following are examples of synthetic fibers? (Select all that apply)
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Which of the following are examples of natural fibers? (Select all that apply)
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What is a basket weave pattern?
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What is a twill pattern?
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What is a herringbone pattern?
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What is the crime scene sample's horizontal thread count?
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What type of weave pattern does the suspect 1 sample have?
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What is the vertical thread count of suspect 2 sample?
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Explain why fiber evidence is not considered reliable evidence.
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Study Notes
Fiber and Textile Definitions
- A fiber is the smallest unit of a textile.
- A textile refers to woven cloth or fabric.
Importance in Forensics
- Fibers can provide crucial clues about a crime, helping to identify attackers.
Collection Methods
- Fiber collection from crime scenes may include vacuuming, adhesive removal, and forceps, but not tweezers.
Crime Case Example
- In the Wayne Williams child murder case, fibers found on victims matched those from a rug in Williams' home, leading to his conviction.
Fiber Classification
- Fibers are classified as either natural or synthetic.
Types of Synthetic Fibers
- Polyester: Durable, retains shape, non-biodegradable.
- Nylon: Strong and elastic.
- Rayon: Moisture absorbent and durable.
- Acrylic: Very strong synthetic fiber.
- Spandex: Lightweight, durable, stretchable.
Types of Natural Fibers
- Cotton: Soft, fluffy, breathable.
- Wool: Odor resistant, moisture-absorbent.
- Cashmere: Extremely soft, durable.
- Silk: Smooth, lightweight.
- Mohair: Durable, resilient.
Weaving Patterns
- Basket Weave Pattern: A type of textile weave that creates a checkerboard appearance.
- Twill Pattern: Characterized by a diagonal ribbing effect in the fabric.
- Herringbone Pattern: A zigzag pattern that resembles the bones of a fish.
Crime Scene and Suspect Samples
- Crime Scene Sample: Horizontal thread count of 8, vertical count of 8, weave pattern is plain/tabby.
- Suspect 1 Sample: Horizontal thread count of 12, vertical count of 13, weave pattern is basket.
- Suspect 2 Sample: Horizontal thread count of 10, vertical count of 9, weave pattern is satin.
- Suspect 3 Sample: Horizontal thread count of 8, vertical count of 8, weave pattern is plain/tabby.
Reliability of Fiber Evidence
- Fiber evidence is less reliable than DNA; it cannot uniquely identify a suspect, thus presenting a broader range of possible suspects.
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Description
Explore the crucial elements of fiber analysis in textiles and its significance in forensic science. This quiz delves into definitions, importance, and collection methods related to fibers, enhancing your understanding of their role in investigations.
