Tho I disapprove of ICE’s actions, let me say a word or two in defense of physical appearances as sometimes indicating legal status —at least in the somewhat distant past. Back in the 1970s when Mexican and US cultures were less homogenized, when working for the farmworkers union, I asked legal farm workers who were complaining about illegals used as strike breakers how they knew the latter were illegal. “Se sabe, Nico,” came the reply. (“One can tell, Nico.”) And after a while I - like the legal farmworkers, was able to tell a bit by the clothes the undocumented wore, and even sometimes by their Spanish phrasing, which didn’t have the “Spanglish” characteristics of Mexican-American Spanish.
Though of Italian descent, when I lived in the border, both US and Mexican border guards mistook me for Mexican because of my darker skin. And until I passed through the highlands of the Mexican state of Jalisco, I doubted the stories Mexicans told me of blond, blue-eyed people living there, so used was I to seeing darker-skinned Mexicans.