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They dust for finger prints and compare them to police records. They look for any data residue, for example hair strands, eye lashes, blood or skin and do DNA tests.

Answer:

Evidence is any material, residue, or other trace that can identify the cause or perpetrator off a crime. The forensic investigator:

  • avoids contaminating the scene with his presence
  • gathers evidence which may be related to the crime in a manner that its original location is known and it is not contaminated by the gathering process
  • maintains the evidence through a chain of custody to prevent tampering with the evidence
  • examines the evidence in an established method using appropriate procedures and tests
  • writes a report on the evidence which includes the results of the examination and any inference that the investigator may make of the data
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