We had an incidental brush with DYFS years ago. They basically have Gestapo powers here in NJ. They can act on any complaint, any observation, any phone call, any fart in the wind. They can take your children and ask questions later. They can interrogate your children, take whatever stories they can develop, and lock you up. It's one of the scariest things I've ever seen.
Of course, our situation wasn't direct, just associated with something they were working on, but they wanted to get all up in our stuff to "interview" our kids about this other situation. We told them to go have anal sex with themselves and we got away with it. Scary stuff though.