They should use bounty hunters to find them.
Not Dog the Bounty Hunter, but more like collection agents who have experience in finding people.
Find the person, send information to ICE. Get a finder’s fee if person is apprehended.
What we need to do is roll back this chain immigration lunacy way back. It should have been done 20+ years ago.
Quite simple. It is far more cost effective to simply put a bounty of 5,000$ on each head, and let the citizens turn them in.