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Crime Scene Operations. Temple College EMS Professions. Evidence Preservation. The most important part of evidence collection is protecting the crime scene. Evidence. Anything that can be used to connect: A victim to a suspect A suspect to a victim A suspect to a crime scene.

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crime scene operations

Crime Scene Operations

Temple College

EMS Professions

evidence preservation

Evidence Preservation

The most important part of evidence collection is protecting the crime scene

  • Anything that can be used to connect:
    • A victim to a suspect
    • A suspect to a victim
    • A suspect to a crime scene
the fundamental principle
The Fundamental Principle
  • It is impossible to be on a crime scene without:
    • Leaving evidence of yourself on scene!
    • Taking evidence of scene with you!

Bite Marks

Broken Fingernails


Blood/Body fluids

Blood Splatters


Tool Marks

Fracture matches





crime scene
Crime Scene
  • Location where any part of criminal act was committed
  • All entry/exit routes from area where crime was committed
evidence preservation1

Evidence Preservation

Patient care is FIRST priority of ALL responding agencies

initial approach
Initial Approach
  • Minimum number of people necessary (one)
  • Minimum amount of equipment necessary
  • Minimum amount of contact required

One person approaches and determines course of action.

Rest of team stays back.

evidence preservation2

Evidence Preservation

A crime scene is no place for a crowd!

evidence preservation3
Evidence Preservation
  • Don’t disturb scene any more than necessary during assessment
  • Watch where you step
  • Pay attention to the floor
  • Avoid kicking anything lying on the floor
evidence preservation4
Evidence Preservation
  • Note transient details of scene as you approach patient
    • Lighting (on/off)
    • Drapes (open/closed)
    • TVs, radios (on/off)
    • Furniture position
    • Evidence of forced entry
evidence preservation5
Evidence Preservation
  • Wear gloves
  • If you must move something to get to patient or do assessment
    • Tell police
    • Note it in your report
  • If you move a DOA, note it in your report, tell police
evidence preservation6
Evidence Preservation
  • If you are there before police:
    • Safeguard scene
    • Seal off entire area
    • Record names of all people who came into contact with scene
evidence preservation7
Evidence Preservation
  • If you are there before police:
    • Try to hold all witnesses at scene
    • Limit conversation between them
evidence preservation8
Evidence Preservation
  • If you are there before police:
    • Record “first” statements by victim
    • Note who victim made statement to
    • Note statements by witnesses
    • Report to police; record in report in quotes
evidence preservation9
Evidence Preservation
  • Do NOT:
    • Smoke
    • Eat
    • Drink
    • Leave wrappers
    • Use bathroom
evidence preservation10
Evidence Preservation
  • Never cut through bullet hole, stab wound
  • Do NOT shake or turn clothing inside out
  • Bag or otherwise secure clothing so police can recover it at the hospital
  • If you try IV and miss, mark site and note in report
  • Be conscious of debris you leave on scene--needles, bandage packages, etc.
evidence preservation11
Evidence Preservation
  • Avoid handling bullets, bullet fragments
  • Place in plastic container
  • Turn over to police
evidence preservation12
Evidence Preservation
  • Leave firearms in exact position found
  • Assume ALL weapons are loaded
  • If firearm must be moved, only one person should handle
  • Outline weapon before moving if possible
evidence preservation13
Evidence Preservation
  • Do NOT handle weapon any way except by grips
  • Do NOT attempt to clear, unload weapon
  • NEVER place anything in gun’s barrel or inside trigger guard
evidence preservation14
Evidence Preservation
  • If victim reports scratching assailant, cover victim’s hands with paper bags; tape loosely at wrists
evidence preservation15
Evidence Preservation
  • Wet clothing should be placed in paper (not plastic) bag, turned over to police.
  • Wet clothing should not be allowed to stay in ANY kind of bag for >two hours.
evidence preservation16
Evidence Preservation
  • Victims of alleged sexual assault should not wash or use restroom until they are examined at hospital
evidence preservation17
Evidence Preservation
  • Do NOT let evidence leave your custody until it passes directly to a peace officer
  • Note in your report that you handled evidence and to whom you passed it
  • Provide your name, unit number to officer to include in his/her report
evidence preservation18

Evidence Preservation

If chain of custody on a piece of evidence is broken, it becomes inadmissible in court!