Political scientists have discovered the European Court of Justice, but has it discovered law? We address this enduring question, first posed by Armstrong in 1998, by tracing the evolution of law in political science work on the CJEU, from a concept understood in rudimentary terms as an external constraint on judicial behaviour to more recent nuanced accounts of legal concepts, doctrine, and judicial practices. While political science has come closer to the nuts and bolts of CJEU decision-making, we argue that there is untapped potential in exploring the multidimensionality of legal cases and the micro-level details of legal interpretation and adjudication.