Pretty sure Utah still offers those firing squads.
http:// www.foxnews.com/politics/2015/03/11/utah-lawmakers-vote-to-become-only-state-to-allow-firing-squad.html
http:// archive.li/Q99EO
https:// www.usatoday.com/story/news/nation-now/2015/03/24/official-firing-squads-utah-allowed/70366174/
http:// archive.li/alvgb