Full Idea
The principle of nomological causality says that if two events are intrinsically causally related, there must be a strict physical law under which they can be subsumed.
Gist of Idea
Causality may require that a law is being followed
Source
Keith T. Maslin (Introduction to the Philosophy of Mind [2001], 7.5)
Book Reference
Maslin,Keith: 'An Introduction to the Philosophy of Mind' [Polity 2001], p.201