If I can just interject, that's part of the problem. The problem is that at the time of arrest, whatever the charge is, in the heat of the moment if I am a police officer, I'm not really worried about language rights.
My job is that you're going in the back of the car one way or the other. I don't care what language it's in, but you're going in the back of the car, and then we'll deal with it from there. That becomes the problem.