Tracking visas would be useless also. So somoene overstays, you have to get a hold of them to deport them.
I think the answer may be how the Saudis and Kuawitis do it. You can come in illegally but you can’t do anything. In those countries you can’t own a cell phone or have a business unless you have a green card(their version) The cops there have no qualms about asking for your papers.
Mess around and break their rules and you are on the next flight out.
If we make it difficult for them to earn a living here they will leave on their own.
Heh, Saudis are among the largest in human trafficking.