Drill: How can we capture a crime scene for use later?

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Presentation transcript:

SWBAT take notes on how to sketch a crime scene in order to analyze rough sketches Drill: How can we capture a crime scene for use later? Tuesday September 30, 2014

The Crime Scene 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 Crime Scene Sketch

The Crime Scene Assists with… Interviewing and interrogating persons Preparing an investigative report Presenting the case in court The Crime Scene Assists with…

Crime Scene Sketch also… Supplements photographs, notes, plaster casts and other investigative techniques Crime Scene Sketch also…

Rough Sketch Finished or scaled sketch Two types of Sketches

Materials needed Paper Pencil Measuring tape Ruler Clipboard Eraser Compass Materials needed

Steps in Sketching a 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 Steps in Sketching a Crime Scene

Measure and Outline Area Use conventional units of measurement Feet, inches, meters centimeters North should be at the top of the paper Measure and Outline Area

Take the longest measurement at the scene and divide it by the longest measurement of the paper used for sketching 1/2inch = 1’ small rooms ¼” = 1’ large rooms 1/8” = 1’ very large rooms ½” = 10’ large buildings 1/8” = 10’ large land area Determining Scale

Measure and outline area Measure from fixed locations Walls Trees Telephone poles Corners Curbs Outlets Any Immovable Objects Measure and outline area

Plot Objects and Evidence Plotting methods are used to locate objects and evidence on the sketch. The most common practice is called rectangle coordinates Plot Objects and Evidence

Rectangular Coordinates Uses two adjacent walls as fixed points as distances are measured at right angles Rectangular Coordinates

Common in outdoor scene Uses straight-line measurements from two fixed objects to the evidence to create a triangle with evidence in the angle formed by two straight lines Triangulation

Contains Direction of North Identifying information in sketch key Scale Make a Legend