A DNA waiver is an agreement not to use DNA evidence as proof that one didn't commit a crime. The Bush administration made it feasible for prosecutors (federal level only) to demand DNA waivers as part of plea agreements.
While I would rather if the Obama administration forbade DNA agreements and used some strong language about the sort of people who would rather not admit mistakes even if it means keeping innocent people in prison, the current situation is that DNA waivers can only be sought in "exceptional circumstances".
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