I've heard that courts have ruled that airports count as "the border" too. So anywhere within 100 miles of an airport. So basically anywhere in the country.

Don't they also count international airports as "the border?" Which changes that number to something like 99.9% of the population.

That doesn't include airports which add any major city not in that red line.

Except the Great Lakes are mostly part of America. Lake Michigan is completely inside The United States, so Illinois is nowhere near the Canadian border.

Chicago isn’t a border city, it’s a coastal city.

They can go anywhere, 100 miles is just where the supreme court gave them automatic probable cause that anybody in that distance is presumed crossing the border and can be randomly searched without a warrant. Outside of that they just have to remember to lie in court like normal cops.

now do all of the major rivers connected to the ocean