A second grader bringing them in for Show and Tell would be expelled.
I remember walking to grade school with my father's Charleville flintlock (used by the colonists during the Revolution) for show and tell. I was in third or fourth grade at the time.
Of course, this was back in the mid-60's, when liberals were still in the closet.
If that happened today, several dozen governmental agencies would respond as if World War III is about to erupt.