Ignoring it would be bad enough, but they also bury it so the Defense can't find it. I think that's a prosecutable offense everywhere, but if the evidence is never found, nobody's the wiser. When Prosecutors and cops start going to jail for trying to railroad innocent people to jail it will stop, and not before.
The policemen in this story have been indicted for their malfeasance, but the DA is playing ignorant and is getting off scot-free, and the cops probably will too, in the end.
Ten bucks says they cop a plea, and since they don't have any leverage they aren't going to get much of a deal.
If the SHTF ever happens,a lot of people are going to be cop hunting.
I can speak to that. I was once involved in a case where it became clear that the accuser was making false claims; to the point that the police testified for the defense. The prosecution hid grand jury testimony/perjury of the accuser that was exculpatory evidence from the defense; until the very last minute should they violate any Brady law and keep their licenses.