It shall be unlawful for any person who has attained the age of 16 years to take any migratory waterfowl (brant, wild ducks, geese, and swans) unless at the time of such taking that person has with them an unexpired federal migratory bird hunting and conservation stamp (commonly called duck stamp), validated by the person's signature written across the face of the stamp in ink.
Iowa Admin. Code r. 571-92.2