Having lived in the US for over 2 years now, I still need to get used to the fact that it’s allowed to possess and carry firearms. Just the occasional sign reminds you to please refrain from bringing them into hotels, government building or supermarkets…

Given it’s such a big part of local customs and morals, most Americans would not have noticed anything weird about this sign at the entrance, but might have perked up when reading about biometrical data instead (which is a hot topic in the US).