When people talk about the rape kit backlog and they ask how many rapists are on the loose, I also tend to ask how many guys are in prison because the DNA was never tested. They shouldn't just test rape kits in open cases or cases that haven't ended in a conviction.

http://www.usatoday.com/story/news/nation/2014/07/24/dallas-mans-exoneration-makes-national-history/13040299/