In our small town police will often park a police car near a troublesome intersection. People slow down and look around for the officer. You never know if they are there are not.
Immigration should do that as well. Park well marked vehicles where they know illegals hang out.
Make some real, some fake. They will never know for sure.
I am all for making it uncomfortable for illegals in this country. We may not be able to round them all up but we should have them thinking they may be next.
Illegals should be required to wear armbands. If found in public without the armband instant deportation. Yeah I said that.
I read of a nurse in Texas laugh that one time when a Migra-green van was illegally parked by the ER entrance, hardly any Mexicans showed up. The interns started kidding that they would park a van like that there when they wanted an easy night.