It is a misconception that prosecutors simply take the job to put people behind bars. Yes, there are bad apples, but they are a minority whose misdeeds attract a disproportionate share of media attention. The vast majority of prosecutors go into this line of work to ensure that citizens get justice—and, in a growing number of cases, that means helping to free wrongly convicted felons.
Last year, 125 men and women were released from prison because they were wrongfully convicted, according to a report by the National Registry of Exonerations. That is more than two people per week and a record number of exonerations for a given year. More than half of these cases—or 67— were overturned because of prosecutors like Mark Larson either cooperated or led the charge to set the record straight and ensure that justice was done.
Read more: http://www.politico.com/magazine/story/2015/03/good-prosecutors-116362.html