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These are the main points covered under Unit 1.
Steps to Processing the Crime Scene
Pneumonic Device |
PPPSCRIPT |
1st P |
Preserve Life (provide medical aid if needed) |
2nd P |
Protect the scene (close off the crime scene) |
3rd P |
Photograph the scene |
S |
Search the scene |
C |
Collect evidence |
R |
Record (write down important info) |
I |
Identify (do a quick scan of the evidence) |
P |
Package the evidence in the appropriate container |
T |
Transfer evidence collected to the crime lab |
Lawful Searches
To conduct a LEGAL search, officers must have at least 1 of the following: |
Probable cause, consent, or a warrant |
Probable Cause |
A reason to suspect that a person has committed a crime |
Consent |
Permission from the person or property owner |
Search Warrant |
a legal document authorizing a police officer or other official to enter and search premises. |
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Crime Scene Searches
Do not dismiss any evidence until you figure out whether it is relevant or not |
Crime scenes should be searched methodically (with a plan, not randomly) |
Which should be searched first: outdoor or indoor crime scenes? |
Outdoor (weather may alter evidence and it is harder to protect) |
Inward Spiral pattern |
Starts at the perimeter of the scene and works toward the center. Good to use when there is only 1 CSI at the scene |
Outward Spiral pattern |
Start at the center, work your way out |
Parallel or Line pattern |
All members of the CSI team form a line and walk from one end of the crime scene to the other. Good for large open spaces like a field. |
Grid search pattern |
Is 2 parallel searches offset by 90°. Good if a more thorough search is needed |
Zone or Quadrant |
CSIs divide up into groups and each search their section. Example in a house someone would search the living room, someone else searches the bathroom & bedrooms. |
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Crime Scene Sketches
Rough Crime Scene Sketch |
Quickly done by a CSI member at the scene. The focus is on getting the layout/location/measurements of evidence at the scene down correctly. Artistic design is not important at the moment. |
Final Crime Scene Sketch |
Is a refined version of the rough crime scene sketch, usually done on the computer or on nice paper. Design is more important here, as this will usually be presented in court. |
Reference Points |
Fixed, unmoveable points in the crime scene that help us determine the location of our evidence. |
Rough vs. Finished Crime Scene Sketch
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