Bandera de Estados Unidos

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Principles of Forensic DNA for Officers of the Court

Mixture Laboratory Reporting

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Laboratories may vary in the way in which they report mixtures:

  • Report the presence of a mixed sample, without an accompanying statistical weight calculation
  • Report the presence of a mixed sample and calculate a random match probability (e.g., when a major contributor can be clearly interpreted)
  • Report the presence of a mixture and calculate the combined probability of inclusion (such as a random match probability) or a combined probability of exclusion
  • Report the presence of a mixed sample and calculate the likelihood ratio of the known contributors to the mixed sample to the unknown contributors to the mixture

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