If We Can't Completely Trust Your DA to Toss Meritless Cases, Maybe Some Balance Can be Found in Developing Arrest Integrity Units??

What about developing arrest integrity units in police departments to check, double check, triple check the evidence before forwarding the case to the prosecutors office? If the integrity unit determines there is not enough evidence to bring charges, then the suspect could be released without being indicted. That way the number of false arrests and convictions will drop. Any interest in this locally??
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In North Carolina , two innocent men were released on DNA evidence[ http://www.nytimes.com/2014/09/03/us/2-convicted-in-1983-north-carolina-murder-freed-after-dna-tests.html?_r=0] considered by the court over 30 years later. Image a DA's office that would have embraced seeking that justice be done by testing decades sooner?