It just needs to be accurate-enough to eventually get a warrant.

you don't need warrants to query these databases

They went from warrant, to FISA, to just write a request about a name, to more or less describe a vague group of ppl on whom you want the data

You should watch this show. It's available online and pretty informative.

If things weren't bad enough in 2007, things that have changed since then are most notably the cloud act that was created, Ring that started to "backup" your home CCTV in the cloud, then also Ring that enabled so called "Search Parties" and made a superball ad about it