I hasten to add that this will also work in areas (such as Bellevue, WA) where black drivers are targetted for traffic stops without cause and harassed.
So what is my great idea?
Every white peerson should buy a mask that fits over your entire head that depicts a Latino/Hispanic person. Say a famous one like Fidel or Che, or the Cisco Kid, or Juan Peron, or for that matter someone dark enough such as a famous Italian or Greek, and go driving. When the cops signal you to pull over, do so, and then surreptitiously tug the mask off and drop it under your feet.
For DWB (driving while black) targetted zones, get an Obama mask, or maybe MLK.
This will occupy the anti-immigration cops by taking up all their time, making them fill out endless reams of paperwork stating, "Thought a Mexican was driving, turned out to be mistaken."
Eventually they'll get so fed up with the whole thing they'll quit doing it. Law or no law, if they don't enforce it, who cares?