DNA also has profound implications for cases that have already been tried: the power to exonerate. After all, if the DNA from the sperm in a rape victim has been stored, and if it does not match the DNA of the person serving time in prison, the conclusion is difficult to deny: it came from a different man, the real criminal. “DNA testing is to justice what the telescope is for the stars: not a lesson in biochemistry, not a display of the wonders of magnifying optical glass, but a way to see things as they really are,”
