In Iowa, you can go on to other properties to retrieve game. You cannot go on to other property with weapons without the landowners consent.

I have always stopped by the owners home first though. That way if there were others hunting his property, I would not be interfering with someone elses hunt. I have also had others claim my deer by getting to it first and tagging it without firing a shot when it has gotten on to other property.

I had a group this past December claim that one of them shot a deer that had come on to my property and they let me know that "they" were going to work their way down through my property to find it. I in return let them know that the one who shot it could walk unarmed from the place where the deer entered my property to the place where the deer was down. I also let them know that since I wasn't busy, I would walk along with him and help him locate his deer. The response then was "Well, I guess it wasn't hurt that bad that it was going to die, nevermind."