Would be interesting to get a comprehensive list of what is and isn't available without a warrant from a judge. For example...

"Police can get phone records without a warrant thanks to a 1979 Supreme Court case, Smith v. Maryland, which found that the Constitution's Fourth Amendment protection against unreasonable search and seizure doesn't apply to a list of phone numbers. The Electronic Communications Privacy Act (ECPA) — a 1986 law that underpins much of how the government can get digital data — requires providers to allow access to real-time data with a court order and historical data with a subpoena."

https://www.propublica.org/special/no-warrant-no-problem-how...