It's really not difficult for them to find some violation that could be some kind of "dangerous" situation. Is every outlet in your house child-proof? Is every bookshelf, dresser, etc. secured to the wall so it cannot tip over onto a child? Are your toilet lids locked closed to a child cannot fall into them? There really is no limit to the things they can find.

Even worse, they can bring your children to psychologists and ask them leading questions that could lead to concerns about anything they like. DCFS can make your life a living hell if they like. And the more you piss them off the more they are likely to do just that.