Crime Scene Processing and Investigation

Initial Steps

• First Responding Officer: Secures the scene and determines need for a crime scene specialist.
• Major Crime: Specialists provide crime scene and investigative support.

Arrival and Initial Survey

• Crime Scene Specialist:
  • Contacts the detective or officer in charge.
  • Exchanges information about the crime.
  • Conducts a preliminary survey with the detective.
  • Establishes entry and exit paths, avoiding suspect's path.

Evidence Documentation

• Walkthrough Evaluation: Forms a plan for processing and evidence collection.
• Video Documentation:
  • Begins with video of the outside and continues indoors.
  • Captures the scene in an undisturbed state.
• Placement of Evidence Markers: Uses cones to mark potential evidence.
• Photography:
  • Establishing shots from outside.
  • Three types of photos per evidence: overall, mid-range, and close-up.
  • Ensures meticulous, high-quality photos.

Processing Specifics

• Cooperation with the detective to discuss potential crimes (e.g. rape, murder).
• Collection of relevant evidence like bullet casings.
• Rough Sketch and Inventory:
  • Initial rough sketch on scene, formalized later.
  • Lists of evidence items created.
  • Utilizes laser measuring devices for accurate coordinates.

Evidence Collection

• Contamination Prevention:
  • Items labeled by number and description.
  • Evidence placed in slider boxes or bags with item description.
  • Chain of custody maintained through careful sealing and handling.

Special Considerations

• Condoms: Used to link victim and suspect.
• Blood and DNA:
  • Samples taken with precautions (e.g., gloves, mask).
  • Blue Star chemical used for blood detection.
  • DNA swabs collected and transported properly.

Fingerprint and DNA Collection

• Fingerprint Collection:
  • Prints lifted at the scene onto print cards.
  • Processed carefully to avoid air bubbles.

Post-Scene Processing

• Return to forensic lab for further processing.
• Crime Scene Sketch:
  • Transferred into digital format using Visio.
• Evidence Logging:
  • Items logged, sealed, and prepared for lab testing.
• Transport to State Police Lab:
  • Evidence kept securely under lock and key until transported.