Privacy advocates got access to Locate X, a phone tracking tool which multiple U.S. agencies have bought access to, and showed me and other journalists exactly what it was capable of. Tracking a phone from one state to another to an abortion clinic. Multiple places of worship. A school. Following a likely juror to a residence. And all of this tracking is possible without a warrant, and instead just a few clicks of a mouse.
The US Supreme Court has had an antagonistic relationship to the forth and fifth amendments to the Constitution of the United States since before I was a kid in the 1970s since they often interfered with efforts to round up nonwhites. But after the 9/11 attacks and the PATRIOT ACT, SCOTUS has been shredding both amendments with carve-out exceptions.
Then Law Enforcement uses tech without revealing it in court, often lying ( parallel reconstruction ) to conceal questionable use, and the courts give them the benefit of the doubt.