 Davidson’s token-identity theory is dramatically different than previous identity theories of mind, in both it’s a priori status as well as its stance towards the role of laws in justifying monism. Previous theories had argued that claims concerning the identity of particular mental and physical events depended upon the discovery of lawlike relations between mental and physical properties. These theories thus held that empirical evidence supporting such laws was required for particular identity claims. According to Anomalous Monism, however, it is precisely because there can be no such strict laws that causally interacting mental events must be identical to some physical event. The token-identity thesis thus requires no empirical evidence and depends on there being no lawlike relations. It in effect justifies the token-identity of mental and physical events through arguing for the impossibility of type-identities between mental and physical properties or kinds (Davidson 1970, 209, 212–13; see Johnston 1985).