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Introduction to Forensic Science

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Presentation on theme: "Introduction to Forensic Science"— Presentation transcript:

1 Introduction to Forensic Science
Forensic Photography

2 Forensic Photography Each crime scene has unique characteristics and the type of photographs necessary will be determined at the scene by the investigator A picture does tell the viewer many stories. The pictures you take will be submitted into court as evidence and your testimony and pictures will be entered into the trial record.

3 Basic Photography Equipment
Camera Electronic flash Film Normal lens Remote for electronic flash Owner's manuals Wide angle lens Extra batteries Notebook and pen Close-up lenses Locking cable release Ruler Flashlight Gray card Index cards Filters Tripod Felt pen

4 Care and Maintenance Cleaning lens and camera Camera repair
Protection from extreme heat and cold Protection from rain

5 Film Color film Black & White film Print film vs. slide film
Film speed

6 Requirements by Crime Types
Homicide inside a residence Use color film Take pictures of the following Exterior of the building Evidence outside the building Entrance into the scene Room in which the body was found Adjacent rooms, hallways, stairwells Body from five angles

7 Homicide Photography Close-up of body wounds Trace evidence Weapons
Evidence of a struggle Signs of activity prior to the homicide View from positions witnesses had at time of the crime

8 Suicide Photography Photograph the scene as if it were a homicide
Take close up shots of wounds, ligature marks, overdose and self-induced deaths Photograph weapon used Document from all angles

9 Burglary Photography Exterior of building Point of entry
Interior views Area from which valuables were removed       Trace evidence        Other physical evidence Damage to locks, safe, doors, tool marks Articles or tools left at the scene by the suspect 

10 Assault and Injury Photography
Photographing injuries Face of victim in the photographs Bruises Bite marks

11 Bite Mark Photography Orientation shot
Close-up at 90-degree angle to avoid distortion Ruler in same plane as bite mark Focus carefully Bracket exposures

12 Traffic Accidents Photographs at the accident scene
Where the vehicles came to rest and in what position Damage to vehicles Do not take any oblique or corner photographs

13 Traffic Accident Photographs
Take six photographs Two from each side in line with the axles Take one of each end of the vehicle, straight on If possible, take one more from overhead

14 Traffic Accident Photography
Debris or skid marks on the roadway View each driver had approaching the key point of the accident View from the point a witness observed the accident, at witness' eye level Evidence to identify hit and run vehicles Night Photography Use multiple flash, paint with light, or available light for extra long skid marks Or to show two vehicles some distance apart

15 Autopsy Pictures are taken of wounds, scratches, marks, tattoos and other identifying marks Pictures are not usually taken during the autopsy An overhead picture is taken of the body before the autopsy The deceased is placed in a room for removal of important evidence found on the body

16 The Purpose of Photographs
Record the original scene Record the initial appearance of physical evidence Pictures will provide you with a permanent visual record of how the scene appeared initially, the position of the body, and all evidentiary items

17 The Purpose of Photographs
It helps to show and tell the story to the jury and the courtroom participants In order for the court to accept these pictures, you must be guided by the rules of evidence and the proper submission of this evidence

18 Use of Photographs in Court
The picture must be relevant and material to the case at hand Photos of brutal killings must not be merely presented as evidence, but should be presented in such a way to acutely affect the emotions of the jury You do not have to be an professional photographer to present a photograph in court, e.g. Mr. George Holliday, the video cameraman in the Rodney King beating case

19 General Crime Scene Photography
Secure the scene Take preliminary notes Take a photo overview of scene (to show the scene exactly as it was when you first saw it) Make a basic sketch Record each item of evidence If items have been moved before you arrived, do not try to reconstruct the scene as it was initially The photograph should depict the crime scene exactly as you found it

20 Major Crime Scene Photography
Good communication between you and other investigators is important Do not destroy evidence as you move about the scene

21 Outdoor Pictures Take a photo of the building where the crime occurred. This may entail a large area Aerial shots would be useful in some cases The original series of photos should show all doors, windows and other means of entrance or exit

22 Indoor Pictures Take a photo of the entrance
Take photographs of the scene, as it appears when you first enter a room Move around the room to get photographs of each entire wall, making sure to get items of evidence in these photos Include photos of the other rooms connected with the actual crime scene

23 Digital Photography Digital photography can aid the investigator in many ways Provides instant access to viewing photos Documents how and when images were captured, processed and stored

24 Digital Imaging Technology
Digital imaging technology has brought powerful new tools to law enforcement Through the use of Adobe Photoshop, Pat Wertheim, a fingerprint examiner from the Arizona State Crime Lab, gave jurors a computer slide show on fingerprint analysis and showed them ridge by ridge how the prints from Westerfield’s RV identically matched Danielle van Dam’s fingerprints.

25 Drawbacks to Digital Photography
Digital images are sometimes not as clear or sharp as traditional images Battery life is short Image authenticity may be questioned in court

26 Photographing Fingerprints
Photography any fingerprint before lifting it Use the following equipment: One-to-one camera and copy stand 35 mm with macro or close-up lenses Place a scale in the photograph

27 Digital Photos as Evidence in Court
Admissibility Are subject to inspection for image manipulation State and Federal laws vary Public Safety agencies must set policy for use of digital cameras Requirements of photos Relevant Authentic

28 Department Policy Development
Develop Standard Operating Procedure Maintain the integrity of chain of custody Preserve original image Preserve in original file format Review your case before you arrive at the court


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