Investigative Photography and Crime Scene Sketches

1. Investigative PhotographyandCrime Scene Sketches

2. Crime Scene Photography • One of the FIRST investigative tasks!!! • Types of cameras used: 35mm SLR Video Digital Polaroid

3. Crime Scene Photography • Advantages of photographs Can be taken immediately Can accurately depict crime scene Creates interest Supports testimony • Disadvantages of photographs Do not show actual distances Can be distorted Digital images can be altered

4. Advantages of Video Taping • Increases Intoxication convictions - DUI • Enhances officer integrity • Provides officer safety • Documents traffic violations • Reduces court time for officers • Lowers liability for misconduct claims • Documents probable cause and evidence

5. Disadvantages of Video Taping • Records unwanted sound • Documents errors made by officers and technicians • Officers not always trained • Discrepancies with Time/Date stamp

6. Types of Photographs Establishing photographs depict an overall view of the scene, buildings, approach and escape routes, witnesses, etc. Medium-rangephotographs depict the relationship between objects, concentrates more on the immediate scene. Close-up photographs depict individual items of evidence.

7. This establishing photograph depicts the overall crime scene.

8. This medium-range photograph depicts the actual scene and relationship of evidence.

9. This close-up photograph depicts a single item of evidence.

10. Flash photography is often needed during the day. As seen in the photograph, the camera’s eye is fooled by the bright brickwork, while the evidence is in darkness.

11. Same photograph, but with a flash. Now the evidence can be seen.

12. Photographs should contain rulers or objects to help establish the size of the evidence. In this instance, the known length of the bill can be used as a scale to determine the length of the knife.

13. Macroscopic photographs depict details of objects, and are taken at extreme close range.

14. An essential documentation step in crime scene processing protocol Sketch Keys to Crime Scene sketch: • Dimension • Distance • Content • Relationship among items of evidence

15. Purposes of the sketch • Record the exact location and relationship of evidence to surroundings. • Refresh the memory of the investigator • Provide permanent record of conditions • Assist prosecutor, judge and jury to understand conditions at the crime scene • Help in questioning suspects and witnesses

16. The General Uses of Photography • Crime scene documentation • Surveillance of people and locations • Mug shots • Line-ups • Laboratory examination of evidence

17. Crime Scene Sketches Sketches are important supplements to photographs and crime scene reports. Sketches…. • Accurately portray physical facts • Relate to the sequence of events • Establish locations and relationships • Provide an overall picture of the scene • Are a permanent record of the scene

18. Crime Scene Sketches The rough sketch is drawn at the crime scene. It is not a finish product, although it does contain measurements and other data. The finished sketch is often drawn by a draftsman to show proper relationships and scales. The finished sketch is more presentable for court presentations.

19. Sketch Requirements • Rough sketch need not be to scale but should be proportional showing accurate measurements to the nearest ¼ inch of the exact placement of the evidence and victim • No changes should be made to rough sketch once you leave the scene • Legend or key should be on both rough and finished drawings

20. Objects in scene should be marked with letters • Evidence marked by a circled number • North indicated on both drawings • Must show all relevant materials • Rough sketch may be made in pencil but final sketch must be made in ink

21. Steps in Sketching the Crime Scene 1. Observe the scene and plan the sketch 2. Measure distances 3. Outline the area (area dimensions) 4. Locate and draw objects and evidence within the sketch 5. Record all details 6. Depict legend, title, scale and direction of North

22. On the final sketch: • Omit measurement lines • Must include all items that were in the rough sketch; no additions, no deletions • Scale notation must be noted • Best if made by same investigator that made the rough sketch • All measurements should face the same direction.

23. Final sketch continued: • Arrow heads should touch measurement lines • All hidden objects should be indicated by dotted lines • No conclusions should be noted on the drawings • Objects located by triangulation or coordinate method when possible

24. A Rough sketch is done by the technician recording the exact placement of evidence and victim.

25. Accurate measurements to two fixed points must be recorded so that a scaled final sketch can be prepared for court presentation. What are good examples of fixed points?

26. Triangulation Method of Locating Evidence A 8’ 10’ Item A is 10’ from the SE corner of the room, and 8’ from the SW corner of the room. These measurements will ALWAYS intersect at item A’s location.

27. Triangulation Method of Locating Evidence A desk Evidence must be triangulated to two fixed points. Not using the corners of the room, how would object A be triangulated?

28. Triangulation Method of Locating Evidence A desk First, the desk is not fixed, as it is not touching the wall and its location has not been determined. To fix the desk, do this:

29. Triangulation Method of Locating Evidence 3’ A desk 1” Now that the desk has been fixed, object A can be fixed from two fixed points from the desk, as such:

30. Triangulation Method of Locating Evidence 3’ A 5’ desk 6’ 1” Now that the desk has been fixed, object A can be fixed from two fixed points from the desk, as such:

31. Triangulation Method of Locating Evidence A desk In this scenario, the desk is flush against the wall. How would object A be triangulated?

32. Triangulation Method of Locating Evidence 3’ A 5’ desk 6’ The flush side of the desk is already fixed. One measurement is required to place the desk along the wall. Object A is then triangulated as usual.

33. Triangulation Method of Locating Evidence desk A This desk is flush in the corner against both walls. How would object A be triangulated?

34. Triangulation Method of Locating Evidence desk 6’ A 5’ Since two sides of the desk are already fixed, object A is triangulated as usual.

35. Triangulation Method of Locating Evidence desk 6’ A 5’ 2’ 2’ B Once evidence is triangulated, it can become a fixed point to triangulate other items of evidence. In this case, object B.

36. Rectangular-Coordinate Method A 15’ B 6’ 10’ 6’

37. Azimuth Method of Triangulation Tree 340° 160° 40° Shed 220° Reverse azimuth:340°-180°=160° N Reverse azimuth:40°+180°=220° W E Body S Compass

38. Administrative Data LEGENDA. VictimB. RevolverC. Shell CasingD. Blood Stain TITLECase: 1234-2001Location: Payson Hall, Room 111Victim: State of New YorkOccurred: Oct 31, 2001, 2300Drawn by: Detective GilbertVerified by: Detective Marlowe Not to Scale North Or¼” = 1 foot

39. Rules for Drawing Sketches • Never measure through space • “Rotating” items require measurements at opposite ends • Oddly shaped items, such as puddles of liquids, are triangulated from center of mass • Do not cross measurement lines • Always have the sketch verified

40. 10” 13” Since the blood droplets are of no particular defined shape, they are triangulated to the “center of mass”

41. Projection Sketch

42. What's missing? Rough sketch of out door crime scene

43. Where are the fixed points in this room?

44. Final Sketch Rough Sketch

45. The Finished Sketch • Is usually prepared for courtroom presentation. • Must be to scale i.e. ¼ in. = 1 ft. • Units used must be consistent • i.e. make all measurements in metric or in feet/inches do not combine.

46. Bird's eye view 2 dimentional representation

47. Bird's eye view 3 dimentional representation

48. Computer representation