This is in Colorado Springs. What about the 100 mile border zone where the federal government pretends all rights are suspended?
Having lived (or maybe more accurately "resided") in the Springs for a few years, this story didn't surprise me at all.
The current government believes in some sort of transitive property of 100 mile border zones. Mathematics hasn't quite caught up with this yet.
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Denver International Airport has a customs zone (as all international airports do), and is only 86 miles from Colorado Springs. AFAIK they've never explicitly restricted their policy to land & sea borders.