CBP can do whatever they want to anybody within a 100 mile radius of a border (maritime included) which is like, 70%+ of the US population.
Even though they’re complete fucking buffoons it’s a really good idea to not fuck with CBP, they get paid to fuck people up with impunity.
And elsewhere on order. Although Portland is within 100 miles, they were sent under a post 9/11 statutory authorization that would have enabled them to perform certain (not border/customs related) federal law enforcement actions anywhere.
An international airport qualifies as a US border too. Think about that for a minute...
Not sure I understand, are you saying GP should've pulled a gun on the cops?