Some forms of ID would be falsifiable if we observed species evolve from a chemical mix or macro-evolution in areas that are considered irreducibly complex, and we could reasonably define all of the mechanisms involved.
How would you exclude the possibility of manipulation at the quantum level by some, as yet, unobserved intelligent designer? What could stop a being with god like capabilities interfering with the molecular interactions in such a way as to produce such an effect without our being able to detect their interference? Isn't this exactly the sort of mechanism you yourself are proposing for the manipulation of genetic sequences?
TTFN,
WK