More from commenter “spudbeach”: “I am _sooo_ glad that I live in Wisconsin. Not only are alienation of affection lawsuits not allowed, it is actually illegal to even threaten one! Wisc. Stats. 768.03 makes it illegal to threaten, and 768.07 sets the penalty to $10,000 fine and/or 9 months in jail.” And XRLQ observes that these laws (still on the books in Hawaii, Illinois, Mississippi, New Hampshire, New Mexico, South Dakota, and Utah, as well as North Carolina) could impose liability not just on paramours, but on plain old friends or acquaintances who’d encouraged an unhappy spouse to leave a marriage. Yet more: Robinette, 2007 (via); The Briefcase.