Idaho Code § 5-330
That no action shall lie or be maintained for civil damages in any court of this state against any person or persons, or group of persons, who in good faith and without compensation, being at, or stopping at the scene of an accident or emergency, offers and administers emergency first aid or emergency medical attention to any person or persons injured in such accident or emergency unless it can be shown that the person or persons offering or administering emergency first aid or emergency medical attention, is guilty of gross negligence in the care or treatment of said injured person or persons or has treated them in a grossly negligent manner. The immunity described herein shall cease upon delivery of the injured person to either a generally recognized hospital for treatment of ill or injured persons, or upon assumption of treatment in the office or facility of any person undertaking to treat said injured person or persons, or upon delivery of said injured person or persons into custody of an ambulance attendant.
Idaho Code § 5-330