Will having evidence about the A do anything (legally speaking) for your custody case?
Legally, no -- not for a D at least. But then there is the fact that this state still has laws against Alienation of Affection and against Criminal Conversation. They're long-shots now-of-days, but still something to consider. Will my WAW risk a "criminal" record in her attempt to push me out of our S's lives? Will she risk financial ruin?