Forensic Hair and Fibers

the transfer of evidence such as a fiber from a source to a person, and then to another person.

• primary evidence

• secondary evidence

• primary transfer

• secondary transfer

Fiber evidence is gathered with:

• vacuums.

• tape.

• glue.

• forceps.

• lint roller.

Two methods that can analyze fibers without damaging them are:

• polarizing light microscopy and infrared spectroscopy.

• polarizing light spectroscopy and infrared microscopy.

• heat and light.

• None of these choices.

What kind of medulla is this?

• Fragmented

• Continuous

• Interrupted/Intermittent

• There is no medulla - Absent

What kind of medulla is this?

• Interrupted/Intermittent

• Continuous

• Fragmented

• There is no medulla present - Absent

Did this hair fall out naturally, or was it forcibly removed?

• Fell out naturally

• Was forcibly removed

The following medullary pattern is called

• fragmented 

• continuous

• interrupted/intermittent

• There is no medulla present - absent

A crime scene victim is wearing running shorts. There are some fibers on the victim's legs below the shorts. The fibers on the victim's legs dissolved in hydrochloric acid and so did the fibers that made up her running shorts. The fibers are

• Cotton

• Nylon

• Silk

• Wool

Tags

NGSS.MS-PS1-2

Which of these cannot be determined by hair

• gender

• human or animal

• race

• manner in which hair was removed (shed or pulled out)

We know hair is from a human if…

• The medullary index is 0.5 or greater           

• The medullary index is 0.33 or less

• The cuticle is coronal

• The medulla is fragmented