The Police will just protect their source under the word of 'secrecy' claiming that fear of public exposure (irrespective of any false claims!) will dry up future informants.

OK, so do the Police on 'conspiracy in harassment (due to negligence)': they didn't cross check the claims (which they have a duty to), and they now know that those claims were false; thus they conspired to do many things that caused trauma - including someone being shot without legal cause.

I used that line on my Council who were protecting malicious complainers harassing me: finally SOMEONE woke up that I was not bullshitting, and suddenly the Nuisance Officers stopped turning up every week to tell me inanities like my grass was the wrong colour, etc... :-)