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Crime Scene
Crime Scene Investigations
During the on-scene investigation, a member of the Criminal Investigation Division is responsible for: 
  • Locating, documenting, marking, and collecting physical evidence - Depending on the crime being investigated this may require the detective to use special equipment (fuming wand, fuming chambers, alternate light source, electrostatic dust print lifter) or special techniques (casting materials, blood spatter analysis, hand washings, chemical processing, bullet trajectory analysis, etc.). All evidence must be photographed prior to collection. 
  • Ensuring the chain of custody of evidence is maintained - The detective must properly mark all evidence prior to collection and it must be accounted for at all times after collection until the case is resolved. If these steps are not taken the evidence may not be admitted into evidence at a trial.
  • Associating persons to the scene of the crime - This can be accomplished through fingerprints, shoe impressions, hairs, fibers, body fluids, etc. 
  • Completing detailed sketches of the crime scene - The detective uses sketches to augment the photographs or videos taken at the scene. Sketches allow the detective to illustrate the location and relationship of all evidence to the crime scene. 
  • Taking accurate measurements of the crime scene - Measurements are taken from two fixed locations to each piece of evidence so the detective can provide specific information to its location and its relationship to all other evidence collected.
  • Reconstructing the crime scene - This is accomplished by taking digital photographs and digital video of the crime scene and its surrounding area.