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At The Crime Scene

At The Crime Scene. Chapter 2. Why are crime scenes valuable?. Place a suspect at the scene Can be used to reconstruct the sequence of events Might provide the modus operandi , motive for the crime (MO). Role of First Responder. First Job = Save lives Detain suspects

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At The Crime Scene

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  1. At The Crime Scene Chapter 2

  2. Why are crime scenes valuable? • Place a suspect at the scene • Can be used to reconstruct the sequence of events • Might provide the modus operandi, motive for the crime (MO)

  3. Role of First Responder • First Job = Save lives • Detain suspects • Protect the crime scene • Detain witnesses

  4. Documenting the Scene • Notes • Date and time • Location • Weather and/or environmental conditions • Description of crime • Locations of evidence relative to key points • Names of all people involved (including authorized personnel, witnesses, and victims) • All changes that have occurred during the investigation

  5. Photography at the Crime Scene • Before anything is touched, the scene needs to be photographed! • Points of entry and exit • Close up images of the victims and evidence (from different angles) • Use a ruler for scale when appropriate • Images from the perspective and view of witnesses • No Photoshop or editing allowed!

  6. Videography at the Crime Scene • Becoming more and more common • Walk through the crime scene and narrate while no one else is present. • Show entries and exits • Locations of evidence, victims, and weapons • Cannot be edited in any way • Link to CBSNews footage

  7. Sketching the Crime Scene • Gives an accurate layout of the crime scene • Everything must be to scale • Includes victims, weapons, evidence, reference points • Can never be tampered with or changed

  8. Collecting and Packaging Evidence • Fragile evidence collected first (fingerprints, blood stains • Wet items need to be dried to prevent mold/mildew • Everything needs to be sealed tightly to prevent leaks/contamination • Typical containers include pill bottles, glass vials, manila envelopes and plastic bags

  9. Collecting and Packaging Evidence • Firearms need to be placed rigidly into a wooden box or gun case • Chemical must be collected and stored in glass containers • Biological items need to be kept refrigerated to avoid degradation • Controls need to be collected whenever possible (including blood and hair samples)

  10. Maintaining the Chain of Custody • Written record of who has had possession of the evidence at all times. • It can NEVER be broken!

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