Over the last decades, addiction has increasingly been conceptualised as a brain disease, which arguably could alter the law’s current approach towards the criminal liability of addicted defendants. In this thesis, an overview of the different ways of conceptualising addiction is provided, before applying this knowledge onto both the legal framework of Dutch criminal law, and to more universal legal concepts. As such, the compatibility of concepts such as intent, premeditation, insanity, diminished responsibility and prior fault, with potentially impaired capacities stemming from addiction, is critically examined. After assessing the ‘law in the books’, the second half of the dissertation contains an evaluation of the ‘law in action’.

This encompasses the role of addiction in case files, the presence of neuroscientific information in cases of addicted defendants, its influence on legal decision-making, and experiential accounts of legal professionals. Combining normative, comparative and experimental designs, this thesis does not only analyse some of the complexities of addiction in the context of criminal justice, but also contributes to the growing practice of interdisciplinary and empirical (neuro)legal research.

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