Is 'snitching' always ethically wrong?

[BimboBob]

Update, mate of mine has reported her ass. He's a family man and rightfully ( as I ) is worried at the thought of her arrogant self destroying the lives of a family with her actions. What happens to her, do police act on this kind of thing or turn a blind eye? p.s It's backed up with evidence

They will turn a blind eye unless she triggers a camera or there is public outcry.