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Principles of Forensic DNA for Officers of the Court

Previous Test Results

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Photo of a scientist examining a test tube filled with liquid
National Institute of Justice (NIJ) (see reuse policy).

Issues to be considered when DNA testing was previously performed include:

  • What items of evidence existed at the time of the trial?
  • What type of analysis or tests were performed on the evidence?
  • What are the limitations of the tests that were performed?
  • Were the results presented at trial and, if not, why?

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