Earlier quoted context omitted.
Also the FISA court has been called an "almost parallel supreme court" by the New York Times, and given that it only hears one side of a case, makes this all the more troubling.
people have talked about only hearing one side of the case, but that's the same for all warrant proceedings. FISA court isn't about declaring people guilty, it's about declaring whether there's reasonable suspicion.
So that is very different.
The main exception that we know about in the regular criminal justice system has been cell site simulators and cell site location information, where the government tried super-hard to prevent people from knowing that this information was being collected or challenging its collection or use.