Once there's any sort of record that there's UXO somewhere it pretty much has to be removed because nobody wants the liability that would be incurred by being t

Once there's any sort of record that there's UXO somewhere it pretty much has to be removed because nobody wants the liability that would be incurred by being the party that dropped the ball. Even if that wasn't the case they generally get found because they're in the way of some construction. You have to remove it for the same reason you have to get every other rock out of the hole you're digging. That said, I'm sure there's a few farmers who have a pretty strong inkling where one is and are actively not looking to disturb that problem.