Well prosecutors and cops are incentivized to get arrests. Whether to pump numbers up for promotions or to use in campaigning.
Accurate, and it does impact their decisions in ways that are sometimes pretty bad
So it wouldn't surprise me if cops turn a cold case into a witch hunt because some partial DNA match in a "private" database gave them a few suspects and then they start to build some case to fit the suspects.
What do you think the ratio is of unsolved rapes, to felony cases that were falsified by cops and prosecutors that led to a conviction? I know the second one happened one time in the recent past, and it was a big enough deal that they made a Netflix special about it. I don't know of it happening a second time besides that.