Forensic Photography Documents and preserves crime scene for investigations. Crime Scene Photographs Show layout, evidence position, and object relations. Unaltered Scene Prerequisite for photographing a crime scene. Overview Photographs First images capturing entire scene and surroundings. Points of Entry/Exit Must be photographed to show marks of force clearly. Scale Item Object like ruler used for size reference. Three Angles Each evidence piece must be photographed from three angles. Nine Photos Minimum Total photos required for each evidence piece. Oblique Lighting Light source at low angle to reveal details. (Typically used for footprints, impressions, tool marks and certain types of fingerprint) Crime Scene Sketch An invaluable aid in recording investigative data that depicts the overall layout of a location and the relationship of evidentiary items to the surroundings. Overview Sketch A bird's-eye-view or floor plan, which is the most common type of sketch. Elevation Sketch Portrays a vertical plane, such as blood stain patterns on vertical surfaces like walls. Exploded View or Cross-Projection Sketch Consists of a combination of overview and elevation, similar to a floor plan except the walls have been laid out flat and objects on them have been shown in their relative positions. Rough Sketch Not drawn to scale, can be created on the scene and later drawn to scale, but should be clearly marked 'Not to Scale.' Triangulation Measuring the distance between the evidence and two fixed points to form a triangle. What must be included on all crime scene sketches? True North, Legend or Key, Investigator Name, Date, and Time Evidence Markers Sketch evidence marked with evidence markers, ensuring that evidence numbers/letters are indicated on the sketch. Unknown Victim An unknown victim is commonly given the name of John Doe or Jane Doe. Primary Crime Scene Initial location where the crime occurred. Secondary Crime Scene Location where evidence is disposed of. Search Warrant Legal document allowing evidence search. Probable Cause Reasonable grounds for issuing a search warrant. Affidavit Written statement supporting a search warrant. What is the purpose of crime scene searching? Recognize, document, collect, and preserve evidence. Line/Strip Method Search pattern using parallel strips for large areas. Spiral Method Circular search pattern, inward or outward. Grid Method Perpendicular search pattern forming a grid. Zone/Quadrant Method Divides area into zones for individual searches.
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