As more and more crime takes on a digital aspect, law enforcement bodies must tackle an online environment generating huge volumes of data. Manual inspections becoming increasingly infeasible, law enforcement bodies are optimising online investigations through data-mining technologies. Such technologies must be well-designed and rigorously grounded, yet no survey of the online data-mining literature exists which examines their techniques, applications and rigour. This article remedies this gap

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... hrough a systematic mapping study describing online data mining literature which visibly targets law enforcement applications, using evidence-based practices in survey-making to produce a replicable analysis which can be methodologically examined for deficiencies.