The FBI has confirmed to the Senate it is once again buying data which can be used to track the locations of US citizens. That may have surprised the people who thought the precedent in Carpenter v. United States prohibited it. But while that case examined if it was legal for law enforcement to obtain location data from mobile networks without a warrant, here the FBI and other agencies have found a way to skirt the Fourth Amendment entirely. Over the last few years, they have taken to
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