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Principles of Forensic DNA for Officers of the Court

Calculation of Random Match Probability for Mixed Samples (cont.)

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The probability for this locus can be calculated in the same way as for a single source sample via the random match probability. Using the same approach, the additional loci will be evaluated.

A typical statement would be the following: The probability of randomly selecting an unrelated individual from the U.S. population who could not be excluded as a contributor to the mixed sample is estimated to be 1 in 2 million.*

* This number used arbitrarily for this example.

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