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Principles of Forensic DNA for Officers of the Court

Specialized Circumstances Involving Y-STR Analysis

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here may be additional specialized circumstances in which a laboratory may deem Y-STR analysis to be appropriate:

  • In sexual assaults, to obviate the need for the time-consuming and oft-times inefficient differential extraction procedure for the separation of sperm and non-sperm fractions.
  • In mixture DNA samples where only the male donor is of interest.
  • In criminal paternity Y-STR haplotype of a missing individual by typing a male relative such as a son, brother, father, uncle, or nephew.
  • To provide increased statistical discrimination in mixture or kinship analysis cases in which the likelihood ratio obtained from autosomal markers is insufficient for identification purposes.

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