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Does racial background affect someone’s ability to recognize someone of a different race? Does the color of someone’s clothing make the person more noticeable? Are bald men more difficult to recognize than men who have hair?

As a result of these commercial observational activities, students will be able to note how many factors influence our ability to observe. Police collect eyewitness accounts of a crime understanding that this is not the most reliable source of information used in solving a crime.

Successful advertisement agencies realize that their commercials need to appeal to that segment of the population that is most likely to purchase the product. The better they target their commercial to the prospective buyers, the greater the chance that particular audience will listen and observe the information given in that commercial.

1. Does the presence of a beard make someone less noticeable or more noticeable? 2. Is an overweight person less likely to be observed than someone of normal weight?

1. When did the crime occur? 2. Who called in the crime? 3. Who is the victim?

1. Can the perpetrator be identified? 2. What did you see happen? 3. Where were you when you observed the crime scene?

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.

Often, several different labs need to share a very small amount of evidence. It is important that the chain of custody be maintained. If the chain of custody is broken, then the evidence may not be allowed in a court proceeding. Identify the error in the following case. After obtaining the evidence, the first lab

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.

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