US Government
Cell Biology (cytology)

Can a DNA test be altered for the results to favor one person over another?



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No. DNA is quite conclusive. It is even able to tell which person (for example) is the father even if the two possibilites are closely related such as brothers. DNA test results are not subjective - there is no human "reading" the results and drawing conclusions. You either match or you don't. The only inconclusive tests will be if there are identical twins involved or if the DNA sample is corroded (ie quite old).