Fiber Analysis Comprehension Check

How would you categorize fiber evidence?

• Class & direct evidence

• Individual & direct evidence

• Class & circumstantial evidence

• Individual & circumstantial evidence

Charlie is visiting Amber's house and fibers from his sweater get on her couch. Amber pants pick up this fiber, so police find these fibers on her pants when they bring her in for questioning about Charlie's murder. This is an example of...

• Direct transfer

• Secondary transfer

Victor get's into a fight with Cody, which causes fibers from Cody's jacket to get onto Victor's shirt. Police later find these fibers on his shirt when questioning Victor about Cody's disappearence. This is an example of...

• Direct transfer

• Secondary transfer

When Kerry leaves the house, fibers from her couch are attached to her sleeves. These fibers are found on the man who struggled with Kerry as he tried to rob her later that day. This is an example of...

• Direct transfer

• Secondary transfer

Natural fibers can be harvested from

• plants and animals

• only from plants

• only from animals

• plants, animal, and minerals

Which of the following is not one of the common ways fibers are collected at a crime scene?

• Tape

• Lint roller

• Vacuum

• Forceps

• By hand

What can be achieved by doing mass spectrometry and gas chromatography analysis on fiber evidence?

• Determining how well the fiber holds dye

• Determining how the fiber respond to heat

• Determining the chemical composition of the fiber

• Making magnified observations of the fiber surface

What would you expect to find if a violent struggle occured between two individuals?

• Transfer of many fibers

• Natural fibers that have been broken down

• Very little fiber transfer

• Primarily synthetic fiber transfer

What percentage of fiber evidence is lost after 24 hours?

• 35%

• 50%

• 75%

• 95%

Which of these is a natural fiber that comes from an animal? You may select more than one if appropriate.

• angora

• silk

• jute

• sisal

• cotton