Crime Scene Sketch: An Overview

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Presentation transcript:

Crime Scene Sketch: An Overview A sketch is worth a1,000 words Photo: http://www.sleeping-demon.freeserve.co.uk/23rd-ltr/part1.html

The Rough Sketch The rough sketch is the first pencil drawn outline of a scene and the location of objects and evidence within this outline. Sketch after photographs are taken and before anything is moved.

Sketching Materials Paper, pencil, long steel measuring tape (longer the better), ruler or straightedge, clipboard, eraser, compass, protractor and thumbtacks.

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 scale Reassess the sketch

Steps in Sketching the Crime Scene Observe and Plan Decide where to start Use fixed locations Measure Distances To Scale Plot Objects and Evidence Rectangular – Coordinate Method Baseline Method Triangulation Method Compass-Point Method

Steps in Sketching the Crime Scene Rectangular – Coordinate Method Uses two adjacent walls as fixed points. Measures at right angles. 36' 11" 4' 2"

Steps in Sketching the Crime Scene Baseline Method Center baseline

Steps in Sketching the Crime Scene Triangulation Method Uses straight line measurements from two fixed objects to the evidence.

Steps in Sketching the Crime Scene Cross Projection Method Presents the walls and floor as they were one surface.

Compass Point Method 47dg 59 dg

File the Sketch Place sketch in secure location.

The Finished Scale Drawing The finished scale drawing is done in ink and on a good grade of paper. You will not be drawing a sketch to scale at the crime scene.

Computer Assisted Drawing Many companies have developed computer hardware to assist in drawing a crime scene.

Admissibility of Sketches and Drawings in Court An admissible sketch is one drawn or personally witnessed by an investigator that accurately portrays the crime scene.

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 Step 2: Measure the room or space in which the crime occurred. Label the dimensions on the sketch

Sketch in the furniture and location of evidence using basic shapes 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 Label the diagram with the date, time, location, and victim’s name (if known) Note: An unknown victim is commonly given the name of John Doe or Jane Doe

Step 6: MEASURING FROM FIXED POINTS Make two measurements from fixed (not moveable) points to each piece of evidence These measurements are noted on a separate document, and not on actual sketch

FINAL SKETCH A. There is never a second chance to sketch a scene, so all information must be noted before leaving B. The final sketch will be completed after leaving the crime scene. C. The final sketch will be drawn with a ruler to scale and may be done on graph paper.