Methods
Crime or accident scene photographers usually capture images in color but also in black and white. The photograph of the skid mark was made during reconstruction at the accident scene to show how and why the ladder had slipped and caused a serious injury to the user. Color pictures are generally preferred because color may be an important aspect of the trace evidence, for example. Thus traces of paint or dye on a piece of evidence may be crucial to linking the evidence with a crime or accident.
Various forces and different countries have different policies in regards to 35 mm film or digital photography. There are advantages and disadvantages to both. Conventional film photographs, even using disposable cameras, have a high resolution, enabling great enlargement should details in a picture need closer examination. Pictures from surveillance cameras are a growing source of evidence for courts, as are pictures taken by bystanders on mobile phones. The former are being used increasingly at accident blackspots, and bystanders may take pictures of events when no police officer or investigator is present, but yet may be critical to a case. Digital photographs usually have an automatic date and time marker on each image, so that authenticity can be verified. Conventional photographs without such marks must be authenticated by the photographer, usually in a witness statement. Pictures of the relative position of objects (as in a Palimpsest) can establish a sequence of events at a crime or accident scene. Due to continued advances in digital technology and software, digital single-lens reflex (DSLR) cameras are increasingly being used by law enforcement agencies.
Read more about this topic: Forensic Photography
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