Crime scene investigation

Question 1

What should you do to prevent cross-contamination?

Answer 1

1. Used non-static, non-fibre and non-attracting overalls
2. Head covered
3. Gloves

Question 2

What are the preliminary matters when investigating a crime scene?

Answer 2

• investigate briefly and secure the scene (IMPORTANT)
• note all conditions (IMPORTANT)
• report fully and accurately (IMPORTANT)
• Note EVERYONE who enters the crime scene
• Take fingerprints

Question 3

What is the process of crime scene investigation?

Answer 3

1. Scene survey and evidence recognition
2. Scene searches
3. documentation
4. evidence collection and preservation
5. release of the scene

Question 4

what are the three methods of crime scene search strategies

Answer 4

• The spiral search method
• Line search method
• Grid search method

Question 5

What are the three important things in terms of documentation?

Answer 5

• Accurate/detailed notes - dated and signed
• Diagrams/sketches accurately labelled - dated and signed
• Photographs

Question 6

what are the processes of collecting samples?

Answer 6

• prevent contamination
• label accurately
• make sure the label is clear
• seel samples to prevent contamination/tampering
• use a label system to record where the sample has been

Question 7

What are examples of physical samples?

Answer 7

blood, saliva, firearms, clothing, fibres

Question 8

What are examples of impressions/photos?

Answer 8

Footprints, tyre prints

Question 9

when can you release a crime scene?

Answer 9

Only when notes/photographs taken and samples made (cannot go back once crime scene released because of possible contamination)

Question 10

What should you do back in the lab?

Answer 10

• Prevent contamination/cross-contamination
• Search clothing
• use lifting tape (fibres, hair)
• stain samplings such as blood and semen
• fingerprints
• rips, tears etc
• UV light search