 Now, with the conceptual argument laid out in full, we are in a position to turn back to Behe and to see how Dembski’s explanatory filter is supposed to let Behe’s god off the hook with respect to the problem of evil. Given the explanatory filter, a bad mutation would surely get caught by the filter half-way down. It would be siphoned off to the side as chance, if not indeed simply put down as necessity. It certainly would not pass the specification test. This would mean that a dreadful genetic disease would not be the fault of the designer, whereas successful complex mechanisms would be to the designer’s credit. Dembski stresses that these are mutually exclusive alternatives. ‘To attribute an event to design is to say that it cannot plausibly be referred to either law or chance. In characterizing design as the set-theoretic complement of the disjunction law-or-chance, one therefore guarantees that these three modes of explanation will be mutually exclusive and exhaustive’ (Dembski 1998b, 98).