If
@factstory??? gives us the back story to their original question,
we might be able to make some more meaningful commentary.
Or perhaps even point them to posts where a similar questions
have been dealt with before.
In the meantime...
All police need to arrest a person is a "reasonable suspicion".
Ordinary police don't decide actual guilt or otherwise.
But they can decide whether or not to charge a given person with a given offence.
Police do not always have much discretion in taking out
(what in NSW we call) an AVO.
Sometimes, doing so is standard police procedure
(pretty much no matter what the PINOP thinks or wants).
By contrast, the Crown (no matter a Police Prosecutor or the DPP)
needs to prove a case beyond reasonable doubt.
That's actually quite a high threshold, and requires highly reliable evidence.
Rather more and better evidence than mere suspicion, an unsupported allegation,
or an emphatic belief.