Exoneration is when a wrongfully convicted person gets released from jail by getting DNA evidence supporting their innocence. For example, a group of teenagers were accused of raping and murdering a women. The police convinced them to sign a confession, and they were sent to jail for fifteen years before DNA evidence became more of a norm. After it was proven that they were not at the scene of the crime, a pair of two other men came forward and confessed to the rape and murder. They were released after a lengthy trial, and were a few of the first people to get successfully exonerated.
This made me feel a little more nervous, to be honest. It's great that we have the ability to rule out who was and wasn't at the scene, but processing DNA evidence is expensive and you have to have a better argument other than "I didn't do it". It makes me worried that police officers may assume I committed a crime I had nothing to do with. However, I think that it's really great that we are able to initially rule out a lot of people, and then later do more specific tests to discover who committed the crime. DNA doesn't lie, after all.