Our expert says:
Dear Book worm
DNA testing is very accurate and inclusion or exclusion of paternity is based on a statistical calculation. It looks at the chance that the genetic variation would occur in the child vs alleged father in relation to its frequency in the general population, which may also differ between different ethnic groups. There has been falsely reported cases and it is usually picked up when the test is redone with another method that use an alternative set of markers. The possibility of a new mutation that can affect the results cannot be excluded but this is why many different markets are used to minimise the effect it may have on the outcome of the test.
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