That would be a simple way to cut down on the problem. Apparently they are so averse to getting into any contact with immigration authorities that they have instructed the Police to look the other way to a great extent. I don't know how far it extends. I'm sure they take them in for DWI, but I fear they might just impound the car and cut them loose when they sober up.
There is an immigration attorney named GORDON QUAN on the city council who has been up to all kinds of shenanigans.
We need some good police work at the local and state levels besides better border control.