> The nexus with reality of that "100 mile" figure is that it represents the limit of the distance at which the USG can establish a permanent checkpoint --- at which CBP is allowed only to stop people who have actually crossed the border.
That's not been true in my experience. I've done some traveling in the southwest and have been regularly stopped at these checkpoints. They are on U.S. highways far from the border and they stop everybody, not people actually crossing the border or who have recently crossed the border.
Now, it is true that their search powers are more limited at these checkpoints than at the border, but they do have the power to stop everyone who passes through. (Whether or not they have the power to question you doesn't seem to be settled, but to try to exercise your right to remain silent is a risky endeavor. Some civil libertarians who have tried to exercise this right have ended up in the hospital.) Which court case are you referring to?
That's not been true in my experience. I've done some traveling in the southwest and have been regularly stopped at these checkpoints. They are on U.S. highways far from the border and they stop everybody, not people actually crossing the border or who have recently crossed the border.
Now, it is true that their search powers are more limited at these checkpoints than at the border, but they do have the power to stop everyone who passes through. (Whether or not they have the power to question you doesn't seem to be settled, but to try to exercise your right to remain silent is a risky endeavor. Some civil libertarians who have tried to exercise this right have ended up in the hospital.) Which court case are you referring to?