The same way the identity of bail jumpers is confirmed.
This is why people who hunt bail jumpers have to post large bonds, which they lose if they get it wrong.
This way, only real illegals get hassled, and, if a mistake is made, restitution is made, too.
It would work. We need some Republicans with enough balls to do it.
How do you determine if the "illegals" are actually illegals.
The same way the identity of bail jumpers is confirmed.
Apples and oranges. A bail jumper is a known identifiable person who has committed a crime. You can look for that specific person and arrest him based on reasonable suspicion that the person looks like the bail jumper, acts like the bail jumper and smells like the bail jumper. As far as a potential illegal alien, it is not reasonably known that the person is an illegal alien until you identify him by asking them for "his papers".
How else would you do it??
It would work.
You have not demonstrated such.
You're overlooking the fact that Republicans have their own reasons for wanting illegal immigration.