is how many comments like this one there are, focusing on the ID part. In Belgium, and surely in other countries that have ID cards, it is indeed in principle compulsory to have said ID card with you. Obviously agents won't randomly stop you on the street and demand to see it, but if you get into any kind of situation where you'd need it - like traffic violations - and you don't have it, I seem to recall there's a fine for that. Not that being illegal has much to do with that, or that illegal people in such a situation would get in much more trouble than citizens, but like I said, it surprises me how much people are complaining about the "oh no, you have to carry ID!" part, as if that's something heinous by itself. And that that gets more attention than, say, the ridiculous thing about allowing citizens to sue their local authorities for not cracking down hard enough on illegals.