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The Crime Scene Sketch. Overview. A crime scene sketch assists in: 1) Interviewing and interrogating persons 2) Preparing an investigative report 3) Presenting the case in court The sketch supplements photographs, notes, plaster casts and other investigative techniques.
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Overview A crime scene sketch assists in: 1) Interviewing and interrogating persons 2) Preparing an investigative report 3) Presenting the case in court • The sketch supplements photographs, notes, plaster casts and other investigative techniques. Two types of sketches • Rough sketch • Finished or scale sketch
Crime Scene Sketch • Accurately portrays the physical facts • Relates the sequence of events at the scene • Establishes the precise location and relationship of objects and evidence at the scene • Creates a mental picture of the scene for those not present • Is a permanent record of the scene!
The Rough Sketch • The rough sketch is the first pencil-drawn outline of the scene and the location of all objects and evidence within this outline. • Not drawn to scale • Distances are measured and indicated in the sketch • Sketch after photographs are taken and before anything is moved. • Use geometric shapes and letters and numbers to indicate items of interest • Measurements need to be made quickly but without disturbing evidence or contaminating the scene
Steps in Sketching the Crime Scene • Observe and plan • Measure distances • Outline the area • Locate objects and evidence within the outline • Record details (make notes) • Identify the sketch with a legend and a scale You will NOT be able to return after today!
Measure and Outline Area • Use conventional units of measurement • Determine North, South, East, and West • Determine Scale Take the longest measurement at the scene and divide it by the longest measurement of the paper used for sketching. • Measure from fixed locations
Cross-Projection Presents floors and walls as the were on one surface.
Where do I start? Step 1: Draw a rough outline of the area- include windows (represented by the rectangles) and doors (represented by openings in the outline)
Step 2: Measure the room or space in which the crime occurred. Label the dimensions on the sketch
Step 3: Sketch in the furniture and location of evidence using basic shapes
Step 4: Label each item in the diagram with a number or letter, then write the name in a key.
Step 5: • Make a legend (key) • Label the diagram • Location (crime scene information) • Investigator(s) • Direction of North (compass rose) • Identifying information in sketch • Scale • Victims name (if known)
