Some wrongful convictions are caused by honest mistakes. But in far too many cases, the very people who are responsible for ensuring truth and justice — law enforcement officials and prosecutors — lose sight of these obligations and instead focus solely on securing convictions. The cases of wrongful convictions uncovered by DNA testing are filled with evidence of negligence, fraud or misconduct by prosecutors or police departments.
While the majority of law enforcement officers and prosecutors are honest and trustworthy, criminal justice is a human endeavor and the possibility for negligence, misconduct and corruption exists. Even if one officer of every thousand is dishonest, wrongful convictions will continue to occur. DNA exonerations have exposed official misconduct at every level and stage of a criminal investigation.
More Information can be found on the Innocence Project's website.