I'm aware of an unofficial convention in some US government departments - if you have a small round green sticker on your pass, then you are opting in as someon

I'm aware of an unofficial convention in some US government departments - if you have a small round green sticker on your pass, then you are opting in as someone who can handle un-sugar coated discussion. It's a great system - you occasionally see someone pause momentarily to check that everyone in the group has a sticker before saying "well, that was a clusterfuck wasn't it".