Once you've had a significant encounter (ie, learning experience) with Child Protective Services or a social worker on speed dial with same, you know this: either you have stupendous financial resources or you shut up and lie low for 18 years.
That's how long your children are hostages to fortune. That's how long you are not entitled to any presumption of innocence. That's how long they are empowered by an almost effortless, almost instantaneous court order to send an armed man to your door to take your children from you.
Lawsuits like that are for the affluent, who are rarely subjected to torment from social workers. CPS agents prey mainly on those they perceive to be feeble and easy to take down.