I knew someone that unintentionally carried a switchblade in their carry-on bag to NYC, discovered that it was in their bag when they were unpacking at the hotel, and then intentionally carried it back home to Chicago in their same carry-on. Both times it passed through an x-ray machine without comment.

This shit is all security theater. Look up how often Red Teams get guns, ammunition, and simulated explosive devices past TSA; you’ll be unpleasantly surprised.