![]() The depth of tread and imperfections on the sides of the tread are preserved with casting. ![]() This is because impressions are three–dimensional and casting preserves three–dimensional evidence. ![]() Photographs of impressions are often used to make positive identifications, but casting of impressions provides the best evidence. Impression evidence can be collected by casting (filling the impression with a compound that hardens and retains the shape and characteristics of the impression) and with photography. When impressions are collected it is possible that identifications can be made linking a suspect or vehicle to the crime. It will be up to the crime scene photographer to determine which would be the best course of action for each item of evidence.įootwear and tire impressions are perhaps the most overlooked evidence at a crime scene. It may be safer to photograph the fingerprint at the scene if there is a chance the fingerprint will be damaged when the evidence is transported to the laboratory, or it may be more effective to photograph the fingerprint in the laboratory due to the specialized lighting available on a copy stand. Several factors may be considered in this example. For example, fingerprints on an item that will be collected as evidence may either be photographed at the scene before packaging or later in the laboratory. This chapter provides more specialized techniques for photographing evidence commonly found at crime scenes.Īs you study this chapter, be aware that many of the techniques in this chapter can also be applied in a laboratory setting. In the previous chapter the basic concepts of evidence photography were discussed. Each item of evidence must be documented photographically, showing its location and appearance. ![]() Several types of evidence are commonly found at crime scenes. © 2014 from the book Crime Scene and Evidence Photography, 2nd Edition Evidence Photography - At the Crime Scene ![]()
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