Then hand them a $100 fine or something if it makes you feel any better. The bigger threat is from terror, not from line-jumping dishwashers.
How about making them go back to the country of origin and waiting their turn?
Oh no, we can't do that now.
bs - if they have a job waiting, they get a visa and come right back.
If they can spend thousands on coyotes to go back and forth, they can spend that, on a one time basis, to be able to go back and forth on a continual basis.