I thought it was 72 hours before the season started. They make it sound like it's completely illegal.
http://www.kfyrtv.com/content/news/Drone-use-for-hunting-game-illegal-in-North-Dakota-451152973.html
http://www.kfyrtv.com/content/news/Drone-use-for-hunting-game-illegal-in-North-Dakota-451152973.html