Immgration

I would like to know why people (obviously foreign decent) standing in a courtroom, facing traffic violations with no drivers license, no social security number and no green cards, are not ordered to prove who they are, that they even have a license to be driving and that they are allowed to be in this country before they are allowed to leave the courthouse. And if they can not do so, why aren't they deported? I'm just curious. From what I hear the judge, baliff, no one in the courtroom even gave it a second thought. One has their case dropped and the other receive the minimum fine and they left. How can this be? Don't they take our tax dollars to pay people to make sure that everyone in this country is here legally? Aren't they supposed to do so to keep us safe? Isn't that the main duty of our government?