1. How Crime Scene Investigation Works

2. CSI Basics
The goal of any investigation is to convict the perpetrator of the crime.
Need to gather physical evidence without disturbing trace evidence
Need to preserve evidence in current form
Need to consider what the lab will need to do with the evidence
Need to consider the legal issues of making evidence admissible in court.

3. Who is there?
Police
CSI unit
District attorney
Medical examiner

4. Police on the scene Police are typically first to arrive
Arrest the perpetrator if still on site
Call for an ambulance if needed
Secure the scene.

5. CSI Team
Documents the scene and collects evidence

6. District Attorney If the investigators need a search warrant
Obtains search warrants from judge

7. Medical Examiner In the case of a homicide
Determine preliminary cause of death

8. Steps of a CSI investigation
Call is made from the police or detectives on the scene to the CSI team to come investigate
Police must be sure the scene has been secured
No random people wandering and disturbing evidence

9. Initial walk-through CSI gets an overall feel for the crime scene
Find out if anything has been moved
Makes general initial theories
Makes a note of potential evidence
At this point - TOUCHES NOTHING!

10. Documents the Scene
Taking photographs and making sketches during a second walk-through.
Walk-through is often done with videotape
CSI still touches NOTHING

11. Collect all potential evidence
Tag, log, and package evidence to stay in tact until it reaches the lab
CSI may or may not do any analysis of evidence depending upon their individual field.

12. Crime Lab Processes all evidence
Lab results will go to the lead detective

13. Video clip

14. At the crime scene
Scene recognition

15. Extent of crime scene Define the boundaries of the crime scene
Example: a homicide
Victim, the house, area around house, cars in the driveway, blood trails, could become quite large

16. Securing the crime scene
Consider other areas that might be part of the crime scene
CSI gets one chance to gather all possible evidence
Evidence becomes corrupted

17. Core area
Most obvious part of the crime scene where the most evidence is concentrated
Usually secured by police
CSI usually extends the area after walk-through
Also contains a safe area to maintain the core area to decrease the potential for error

18. Search warrant CSI will obtain a search warrant
Ensures the evidence will be admissible in court

19. Walk-through
CSI takes immediate note of details that will change over time
Weather
Time
Smells
Sounds
Smoke
Also checks for potential hazards
Gas leaks
Fire
Dogs
Other suspects

20. Interesting, right?
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