THE CRIME SCENE SKETCH - ca01001129.schoolwires.net
THE CRIME SCENE SKETCH The 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 INTRODUCTION A crime scene sketch assists in: Interviewing and interrogating persons Preparing an investigative report 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 OVERVIEW The rough sketch is the first pencil-drawn outline of the scene and the location of objects and evidence within this outline.
Usually not drawn to scale Although distances are measured and indicated in the sketch Sketch after photographs are taken and before anything is moved. Sketch as much as possible. THE ROUGH SKETCH Paper
Pencil Measuring tape Ruler Clipboard Eraser
Compass (maybe) SKETCHING MATERIALS 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 THE CRIME SCENE A steel tape measurer is best It doesnt stretch making it more accurate Use conventional units of measurement
Inches Feet Centimeters Meters MEASURE AND OUTLINE AREA North should be at the top of the paper.
Determine Scale Take the longest measurement at the scene and divide it by the longest measurement of the paper used for sketching. Common scales: = 1 small rooms = 1 large rooms 1/8 = 1 very large rooms
= 10 large buildings 1/8 = 10 large land area MEASURE AND OUTLINE AREA (CONT) Measure from fixed locations Walls Trees
Telephone poles Corners Curbs Outlets Any Immovable Object MEASURE AND OUTLINE AREA (CONT) Plotting
methods are used to locate objects and evidence on the sketch. They include the use of: Rectangular coordinates A baseline Triangulation Compass points.
PLOT OBJECTS AND EVIDENCE Uses two adjacent walls as fixed points as distances are measured at right angles RECTANGULAR COORDINATES Run a baseline from one fixed point to another, from which measurements are taken at right angles. BASELINE METHOD Common in outdoor scenes 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 Uses a protractor to measure the angle formed by two lines COMPASS POINT METHOD Presents floors and walls as the were on one surface. CROSS-PROJECTION METHOD Contains: Case number
Investigator Type of crime Persons assisting Victims name Sketchers name Location Direction of North Date, time
Identifying information in sketch - Key Scale MAKE A LEGEND
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