 Norton’s demand that any causal principle needs to be a universal principle may be on a stronger footing within the metaphysical project and in fact Norton himself calls his argument “the fundamentalist’s dilemma”: If a metaphysical account of causation is committed to the principle “same cause–same effect” or even just to a probabilistic version of this principle, then the existence of genuine indeterminism in physics of the kind discussed by Norton would pose a serious threat to that account. 