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Your position is logical, but unfortunately there is by now a large body of precedent saying that that gaping loophole is fine. So for example police can’t track your movement without a warrant, but they can buy that info from the phone companies.

This could be fixed very simply by a law. The chances of such a law being passed are sadly extremely low.

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Correct. This is called "third party doctrine," and the theory is that since you've voluntarily entrusted this data to the third party, you have no reasonable expectation of privacy in it and a warrant is not needed.

"but they can buy that info from the phone companies"

Actually, they are starting to crack down on some of that with the recent SCOTUS case on cell location tracking. I forget the case name, but that was within the last 4 or so years.

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