There are serious problems with the assumption of causal closure of the physical in Davidson’s framework (for discussion, see the supplement on Causal Closure of the Physical in the Argument for Anomalous Monism). It is difficult, however, to see how Davidson can move from the claim that mental events must instantiate non-mental, strict law properties to the claim that these properties must be physical without assuming closure. Why assume that only ‘physical’ properties are nomic? This raises