Here’s the regulation reguarding ‘Ice Fishing Shelters’ from the 2010 Iowa Fishing Regulations Booklet;
“Ice fishing shelters left unattended on land or water under the jurisdiction of the state, must have the owner’s name, street address and city in 4-inch or larger block letters (in a color contrasting to their background) on all sides, but do not need to be registered. Reflectors must be attached to all sides on any shelter left on the ice after sundown. Structures must not be locked while in use. Shelters must be removed from all state owned lands and waters by Feb. 20 or ice melt, whichever comes first, unless the deadline is extended.”
This reg. mostly pertains to permanent shelters left on inland lakes but can be extended to all shacks or shanties statewide.
But the key word here is “unattended”. If your friend was in or near his shack he should have told that CO to urine up a rope and reread the regulation. This is why I always have the book on me when fishing.
This incident sounds more like a new CO that is going to come in and straighten the world out according to HIS law.