Why isn't there some kind of "privileged access" test? If the third party gives the information to anyone upon request, it should be considered less private tha

Why isn't there some kind of "privileged access" test? If the third party gives the information to anyone upon request, it should be considered less private than if the police need to "ask" for it. Not in an absolute sense. A concerned citizen might want to be helpful to police by providing them lots of information, and that shouldn't need a warrant. But it seems like a pretty strong signal that, if the police are asking for it, it is more likely to be private.