The new detective you are assisting is interested in finding out more about how the possibility of DNA analysis affects procedure at the crime scene and afterwards. Write a memo for his benefit, addressing the following issues:

• Brief explanation of what DNA analysis is and how it can be used as evidence in criminal investigations.
• Explain why extra caution must be exercised when collecting DNA analyzable evidence.
• Discuss the precautions that must be followed to avoid contamination of evidence that may contain DNA evidence.
• Describe the methods for collecting and storing DNA evidence.
• Identify and discuss at least one controversial issue connected to the collection and/or use of DNA evidence.