CIA 1 Review D--Fibers

Fabric is made of _______ which are made of twisted __________.

• Yarn, fibers
• Yarn, filaments
• Filaments, fibers
• Fibers, filaments

What is the most widely used man-made fiber?

• Nylon
• Polyester
• Cotton
• Spandex

_______________ is an animal fiber coming most often from sheep, but may be goat (mohair), rabbit (angora), camel, alpaca, llama, or vicuña.

• Rayon
• Wool
• Cotton
• Silk

The most important factor in determining the value of fiber evidence is: __________.

• volume
• smell
• thickness
• uniqueness

Fibers are found on the victim of a crime scene that match a particular brand of carpet manufactured between 2001-2012. Investigators locate similar fibers in the home of a suspect. This would be classified as ___ evidence and would ___________.

• class, prove the suspect was the perpetrator
• individual, prove that the suspect was the perpetrator
• individual, suggest that the suspect may have been involved with the crime
• class, suggest that the victim may have come into contact with the suspect’s carpet

You are performing a flame test on a sample of fiber removed from a crime scene. The sample burns without self-extinguishing, chars, and leaves a fine gray ash residue that smells like burning paper or wood. The sample you have is most probably:

• Cotton
• Wool
• Acetate
• Asbestos

You are performing a flame test on a sample of fiber removed from a crime scene. The sample is self-extinguishing, melts and shrinks from the flame, leaves a hard bead of residue and has a celery-like odor. The sample you have is most probably:

• Flax
• Nylon
• Asbestos
• Triacetate

You are asked to process a crime scene in which there may be trace fiber evidence. Which of the following is a reliable method of collecting this evidence?

• Sweep the floor with your hands and see if you find any loose fiber.
• Carefully examine the scene for possible fiber sources, then use tape to collect.
• Allow the cleaning crew in the building to vacuum the entire floor, then sift the bag for evidence.
• Create a grid search pattern and have everyone examine any fibers they find, throwing away those that do not seem to be relevant.