If it's against state law, it's generally considered a breach of Etiquette.

Related:

• It is far more impressive when others discover your good qualities without your help.
  Miss Manners (Judith...
• We are all born charming, fresh and spontaneous and must be civilized before we are fit to participate in society.
  Judith Martin, "Miss Manners' Guide to Excruciatingly...
• If you are rude to your ex-husband's new wife at your daughter's wedding,
  you will make her feel smug. Comfortable. If you are...
• The polite thing to do has always been to address people as they wish to be addressed,
  to treat them in a way they think dignified. But it...
• The birds are singing, the flowers are budding, and it is time for Miss Manners to tell young lovers to stop necking in public.
  It's not that Miss Manners is immune to romance. Miss...