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1. If someone’s hair did match the crime scene, what type of evidence could be obtained to indicate that the DNA at the crime scene is a match to their DNA and not to anyone else’s DNA? 2. Write a clear and organized essay. 3. Describe the basics of forensic hair analysis.

1. Is it possible that none of the hair samples matches the hair found at the crime scene? 2. Is it possible that more than one person’s hair matches the crime scene? 3. If someone’s hair does match the crime-scene evidence, does that mean that he or she committed the crime?

Describe how you can determine that the hair sample left at the crime scene is definitely a human hair and not an animal’s hair. Include calculations in your answer. Record your answer on the last page of the data sheet.

You might say that some people’s hair is very fine. Others may have hair that is very coarse. The diameter of the hair provides us with another way to compare a suspect’s hair to the crime scene hair. In this lab activity, you will compare the crime scene hair with three suspect’s hairs by comparing

1. Explain why hair is considered class evidence. 2. Write a convincing argument stating your case that the suspect’s hair either matches the hair found at the crime scene or that the hair does not match hair found at a crime scene.

A crime-scene investigator views two small, red fibers. One fiber was obtained from the crime scene off the victim’s body, and the other red fiber was removed from the cuff of the suspect’s pants. Although the two fibers appear to be from the same fabric, the crime-scene investigator determines that the two fibers are indeed

1. Describe three sources of natural fibers. Provide an example of each type of natural fiber. 2. Silk is a natural fiber produced by the silkworm. How is silk produced by the body of the silkworm?

1. Explain how the inhalation of asbestos fibers can lead to lung cancer. 2. Explain why roofers removing old asbestos roofs are more at danger of developing lung cancer than a person who installs asbestos flooring.

Fibers collected as trace evidence are often considered to be class evidence and not individual evidence. For example, the presence of a white cotton fiber found on a suspect and found on a victim at a crime scene is not enough evidence to convict the suspect. Justify this statement.

1. Identify fibers using microscopic examination. 2. Collect and record data. Apply data collected to solve a forensic problem. 3. Think critically about how well your testing solved the problem and identify possible sources of ambiguity.