I have several German coworkers. They have (and have to carry) the national ID cards described here - they look to have been the idea behind the passport card

I have several German coworkers. They have (and have to carry) the national ID cards described here - they look to have been the idea behind the passport card now available from the US. There doesn't seem to be anything required for Canadians or US-ians, but I think a lot of people don't carry all their ID's all the time (unless a border-crossing is intended). It strikes me as a reasonable argument that things should apply to all equally. Cynically, start with government officials, and then extend it to the general population once things are debugged.