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Communication Skills, Report Writing, and Courtroom Testimony for Forensic Analysts

Single Source

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Reporting Guidelines - Single Source

ResultsReporting

Match

OR

Random Match

OR

Probability Statement (generally only given on probative samples)

  • The DNA profile from ___ matches the DNA profile from ___ at all 14 loci (or list appropriate number).  The approximate incidence of this profile is 1 in __ Caucasians, 1 in ___ Black, and 1 in ___ Southwestern Hispanics (or use appropriate population groups).
  • The DNA profile from ___ matches the DNA profile from ___ at all 14 loci (or list appropriate number).  The frequency of occurrence for this DNA profile in an unrelated individual is 1 in ___   for Caucasians, 1 in ___ for Black, and 1 in ___ for Hispanics. (or use appropriate population groups).
  • The DNA profile obtained from ___ matches the DNA profile obtained from ___. The probability of selecting an unrelated individual at random having the same DNA profile is approximately 1 in x in the Caucasian population, 1 in x in the Black population, and 1 in x in the Hispanic population.  (or use appropriate population groups).

Example of a Unique Statement

  • __ is the source of the DNA obtained from ___.

Questioned sample does not match any known samples

Note:  Statement regarding NDIS will only be included for samples meeting the standards for inclusion/uploading.

Note: Depending on circumstances the database may be national (NDIS) or local (SDIS or LDIS)

  • The DNA profile from ___ does not match the DNA profile from ___.  This profile will be searched against the DNA profiles in the National DNA Index System (NDIS) and any matches will be reported.
  • A full DNA profile was obtained from __, which gives indications of originating from a male/female individual. The DNA profile from (Exhibit__) has been entered into a database and will be periodically searched against the Convicted Offender Database and             the Casework Indexes.
  • ___ is excluded as having contributed to ___.
  • The DNA profile obtained from ___does not match the DNA profile obtained from ___; therefore, ___ is excluded as the source of the DNA from ___.

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