Why were gloves necessary in the collection and handling of trace evidence? What other instruments could be used to improve on your ability to identify evidence? Demonstrate the correct techniques for collecting and handling evidence.

A home burglary has occurred. It appears the perpetrator entered after breaking a window. A metal safe had been opened by drilling through its tumblers. A suspect was seen running through the garden. Three suspects were interrogated and their clothing examined. List at least three examples of trace evidence that might be found on the

1. Some examples of trace evidence are listed. For each item, suggest a possible location where the trace might have originated. For example, broken glass fragments—headlight from a hit-and-run accident. 2. Explain the correct procedure for securing and examining a crime scene.

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.

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?

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. 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.

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 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.

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?