the tools of natural science are useless to determine the "I.Q." of the intelligence, the efficiency vs. the emotionalism of the intelligence, or the motive of the intelligence. That data, analyzed by only the tools of natural science, often cannot permit the investigator to construct a theory of why the perpetrator acted. The mental and conscious processes going on in the criminal's mind are outside the scope of the sciences of chemistry and physics.
Thus it is obvious that scientific methods can lead to the conclusion that an intelligence did something, even if those same methods cannot tell you who specifically did it, or why they did it.