Nancy Petro recently blogged here about the exoneration of Jabbar Collins, who is now bringing a civil suit against the City of Brooklyn and individual prosecutorial staff for misconduct in his case.
The year of 2012 saw the discovery of additional cases of misconduct involving same district attorney’s office, leading to the exoneration of Ronald Bozeman, Lawrence Williams, and Darrell Dula in three different criminal cases.
All three spent 10 months to 2 years in jail due to governmental misconduct before being released for crimes they did not commit. Read more about them here, here, and here.
Wrongful Convictions Blog 
Is there a charge when the DA and prosecutor refuse to act on an obvious crime?