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DNA - A Prosecutor’s Practice Notebook Inventory

Typing Results

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Photo example of DNA Typing Results for Individuals
National Institute of Justice (NIJ) (see reuse policy).

To assist the jury in understanding the DNA analyst's testimony, the prosecutor may consider having a copy of the typing results enlarged and have the DNA analyst circle each match site to clarify the match for the jury.

After testifying to the DNA results, the DNA analyst should testify to the statistical calculations resulting from the analysis. Concerning these calculations, the prosecutor should have the DNA analyst explain that the statistic was derived by using a population database to determine how rare or common each allele is. This method is generally accepted within the scientific community as providing an accurate figure for how often one would expect to see this profile in the general population.

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