US courts have repeatedly ruled that rights afforded under the us constitution protect all people within this country, regardless of how they got here. There is a new case brought by the family of a mexican boy, age 12 or so, who was killed by us border patrol who fired across the border, and basically murdered the kid. They cant even say he was throwing rocks and it was self defense, because he was far out of stone throwing range when they shot him. So far, his case has been allowed to proceed. If he prevails, it will extend the protections of our Constitution just a little farther - a bullet's distance from the border instead of the actual border.