Yep, and that is also an explicit requirement for interviewers at every company I worked at. I had to do interview training myself at one of them, and the guid

Yep, and that is also an explicit requirement for interviewers at every company I worked at. I had to do interview training myself at one of them, and the guidelines were fairly specific and clear about this. We neither knew about the immigration status of the candidate nor were we allowed to ask/note/talk about it at all. Same as with age/marital status/etc.