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Re:Junk Arson Science Sent Claude Garrett to Prison for Murd... by cannonedhamster on Thursday October 11, 2018 @03:46PM (#18196468)
DNA has been used to help free people, but even when the evidence is available it's often suppressed to get a conviction.

https://en.wikipedia.org/wiki/Innocence_Project

Re:Junk Arson Science Sent Claude Garrett to Prison for Murd... by boomboomsubban on Friday October 12, 2018 @03:55AM (#18199961)
It still isn't perfect, and the certainty of a match has been over sold to get convictions too. It's rare, and requires intentionally misleading people, while my other examples could be wrong with everybody trying to be honest.