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DNA Testing The most common form of DNA analysis is called polymerase chain reaction (PCR). PCR has allowed investigators to successfully analyze evidence samples of limited quality and quantity. The PCR process makes millions of copies of very small amounts of DNA. This enables the laboratory to generate a DNA profile, which can be compared with the DNA profile from a suspect. A statistic is then generated to reflect how often one would expect to find this particular DNA profile in the general population.
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