You stated above that "there are study tools all the way from hard to soft". What are the "hard study tools" that may be used to investigate supernatural causes? Are you now saying that these tools don't, in fact, exist, and that you are simply speculating that such tools may exist at some point in the future?
Okay, then, let's examine this on a more hypothetical level, and proceed one step at a time. What, in your view, constitutes a "supernatural cause"?
I was talking about the variety of tools that available for doing any kind of research.
Now I see where your misunderstanding came about.