Do now: What steps do you take in processing a crime scene?

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Presentation transcript:

Do now: What steps do you take in processing a crime scene?

THE CASE: As part of his job, a man climbs a ladder, gets caught in a windstorm and ends up trapped inside a glass booth. Some people see him struggling and offer money; others turn their backs and walk away. The man never asks for help and no one makes any effort to help him. THE MYSTERY: What is this man’s occupation and who pays him? CLUES: The man’s job requires training. The man wears the same outfit to work every day. Some laugh at the man’s struggles. The man does not receive a regular paycheck. The man relies on the kindness of strangers. The man wears black and white makeup to work.

Survey The Scene of the Crime Aim: How does Locard’s Principle apply to a crime scene?

The Scene of the Crime…

Analyzing & Processing the Crime Scene  Approach, Secure, and Protect Scene  Determine scene boundaries (preliminary survey)  Conduct a walk-through  Determine personnel & equipment needs  Develop general theory of crime  Evaluate physical evidence possibilities  Concentrate on most transient  Evaluate if the scene or evidence appears “contrived”  Has evidence been moved? Missing?  Narrative description- written, audio, video  Photograph scene- ASAP!- Before evidence collection & from eyelevel  Use recognized scale device for size determination (photo with & without)  Photo entry and exit  Photo spectators standing around watching activities  Victim can be examined after all photos are taken

Sketch/Diagram scene Sketch/Diagram scene - Permanent record of items, conditions, distance/size relationships - Rough sketch is drawn at scene - What to include? - Specific Location - Date / Time - Case Identifier & Preparer - Weather Conditions - Lighting Conditions - Scale - Compass Orientation - Evidence - Measurements - Key or Legend

Conduct detailed search Conduct detailed search - Based upon evidence possibilities - General to Specific - 3 Dimensional - Specialized search patterns - Evidence log - Proper collection techniques - Seal all evidence containers at scene - Obtain “Known Standards” (e.g. fiber sample from carpet) Conduct final survey Conduct final survey - check for errors Release crime scene Release crime scene - Time, date. To whom, by whom - Re-entry may require a warrant

“Fingertip Search” -Coveralls prevent searchers’ clothing from contaminating the scene. Examined after for residual evidence. -Gloves prevent searchers’ DNA from contaminating the scene. -Masks are worn to protect evidence. (& sometimes safety of searchers) -Shoulder-to-shoulder fingertip search is used for small crime scenes & trace evidence collection. -Notes written at scene are valuable as evidence. Photography is vital! Police search an area where a woman’s body was found in a suitcase in 2001

Sample Crime Scene Photographs