Our elected officials and law enforcement officers already know who most of the illegals are, and mostly where they are.
But heck, they can fool people like yourself into thinking they’re actually doing something about it by setting up another unconstitutional government program and database and decide whether or not you get to eat.
A system the illegals will simply avoid or scam some more, while elected officials do nothing about it.
Congratulations.
You are talking major profiling with your perspective. Interesting. It still won't have any assurance of finding everyone.
Any other options?