The only thing states, CPS or local law enforcement have to prove is that they were working in good faith. That is it. A child a parent nor anyone else will not receive any judgements if a court finds that CPS was working in good faith. Doesn't matter what some psychobabble dr. claims. If CPS was/is working in good faith they will be protected from a lawsuit.

The only thing so far that anybody has claimed was false was a phone call. If that is true then right at this moment the ONLY person that can be sued is the individual that made the false call.

If that cult can find some evidence that the local law enforcement or CPS did what they did maliciously, or a CPS worker committed perjury to get in that compound or remove the children then that is a completely different scenario.

From what I have gathered local law enforcement had left them alone. I can't find any previous mention of CPS investigations in to that particular compound of that FLDS cult either. Not the actions of people who are/were acting maliciously.