Idaho Code § 46-1016

No person, partnership, corporation, association, the state of Idaho or any political subdivision thereof or other entity who owns, leases, controls, occupies or maintains any building or premises which shall have been designated by proper authority for civil defense as a shelter from destructive operations or attacks by enemies of the United States shall be liable to any person for property damages, bodily injury or death resulting from or caused by the condition of said building or premises or as a result of any act or omission or in any way arising from the designation of such premises or buildings as a shelter when such person has entered or gone upon or into said building or premises for the purpose of seeking refuge therein during destructive operations or attacks by enemies of the United States or during tests ordered by lawful authority, except for acts of wilful negligence by the owner or occupant of such building or premises or other person responsible for the maintenance thereof, or by his servants, agents or employees.