[convolvatron]

general enforcement of federal law as a special exception of the 4th amendment doesn't seem to be in the charter passed by congress in https://www.law.cornell.edu/uscode/text/6/211

no judge thought there was sufficient evidence to grant a warrant in this case, so what you're saying is that any CBP agent can go fishing for anything they want. anyone can be detained for any reason that an individual CBP agent considers necessary.

[tsimionescu]

There is established precedent on the fact that CBP can search the phone or other devices of anyone crossing the border for no reason whatsoever. I couldn't tell you the exact justification, but I guess it could have been found to follow from the act you cited: (2) ensure the interdiction of persons and goods illegally entering or exiting the United States;

See this article quoting a 7th circuit case on this matter: https://www.jdsupra.com/legalnews/your-phone-can-be-searched...