Excellent link, thanks.
Here is the parts of that article that I believe are most relevant to this discussion:
What fewer people have noticed is the phrase "lawful contact," which defines what must be going on before police even think about checking immigration status. "That means the officer is already engaged in some detention of an individual because he's violated some other law," says Kris Kobach, a University of Missouri Kansas City Law School professor who helped draft the measure. "The most likely context where this law would come into play is a traffic stop."
As far as "reasonable suspicion" is concerned, there is a great deal of case law dealing with the idea, but in immigration matters, it means a combination of circumstances that, taken together, cause the officer to suspect lawbreaking. It's not race -- Arizona's new law specifically says race and ethnicity cannot be the sole factors in determining a reasonable suspicion.
For example: "Arizona already has a state law on human smuggling," says Kobach. "An officer stops a group of people in a car that is speeding. The car is overloaded. Nobody had identification. The driver acts evasively. They are on a known smuggling corridor." That is a not uncommon occurrence in Arizona, and any officer would reasonably suspect that the people in the car were illegal. Under the new law, the officer would get in touch with U.S. Immigration and Customs Enforcement to check on their status.
But what if the driver of the car had shown the officer his driver's license? The law clearly says that if someone produces a valid Arizona driver's license, or other state-issued identification, they are presumed to be here legally. There's no reasonable suspicion.
Is having to produce a driver's license too burdensome? These days, natural-born U.S. citizens, and everybody else, too, are required to show a driver's license to get on an airplane, to check into a hotel, even to purchase some over-the-counter allergy medicines. If it's a burden, it's a burden on everyone.
Still, critics worry the law would force some people to carry their papers, just like in an old movie. The fact is, since the 1940s, federal law has required non-citizens in this country to carry, on their person, the documentation proving they are here legally -- green card, work visa, etc. That hasn't changed.
Even though this article puts an end to the excuses from the left, something tells me they will invent something else to bitch about.
