Seven Steps to Processing a Crime Scene Unit #1: Introduction to Forensic Science

What has to happen before investigation of a crime must occur? Yvonne Fletcher, Libyan Embassy, 1984

Step #1 – Secure the Scene Who’s responsibility? What is a priority? Keeping the perimeters and scene protected Who should respond?

Step #2 – Separate the Witnesses Reason for separation Collusion Types of questions asked by detectives: When did the crime occur? Who reported the crime? Who are the victims? Can you identify the perpetrator? What did you see happen? Where were you located at the time of the incident?

Step #3 – Scan the Scene What do you notice? Primary or secondary?

Step #4 – See the Scene Documenting Crime Scene Examiner’s responsibilities Photographing the overall area Close ups with and without measurement tools Different Angles

Step #5 – Sketching Methods What is needed: Accuracy and notation of a body(ies) if present Anchored landmarks Orientation Inclusion of furniture and wind Includes vegetation, cars and other vehicles A final draft Why two drafts required?

Kurt Cobain, Seattle, 1994

Step #6 – Searching for Evidence 4 different patterns How to know which pattern to use What about lighting? Types of evidence Labeling identified evidence Spiral Linear Zone

Step #7 – Secure and Collect Evidence Procedures Local municipalities versus FBI and CBI Liquids and arson related evidence Biological evidence Packaging process Chain of Custody Procedures Packaged, sealed and labeled

JonBenet Ramsey December 25, 1996