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 Once two DNA samples (i.e., the defendant's DNA and what was found on the evidence) are typed at a number of STR loci and are found to be sufficiently similar such that they could have originated from the same source, the analyst must determine the significance of the comparison. In other words, the analyst must determine how common or rare the particular DNA profile is based on population frequency data. The analyst does this by calculating the profile frequency, also called the random match probability. The profile frequency is simply the probability that an unrelated person chosen at random from the population ...