This research examined the management of allegedly dangerous individuals by cantonal police forces in Switzerland. The phenomenon of preventive policing was investigated through the recording and analysis of approximately 300 cases handled by the institutionalised threat and risk management units of three cantons. For the first time, empirical insights have been developed regarding who these alleg-edly dangerous individuals are and what common features and differences they exhibit. This study examined both the structure and procedures, as well as the decision-making of police forces dealing with such individuals. Topics of special interest included risk assessment approaches, the role algorith-mic decision-making plays, and the measures taken to mitigate risks. These procedures were appraised in light of their human rights implications and legal foundations. As the area of preventive policework has received little attention from the legal field, this report represents a basis for further discussion and will provide policymakers, legal scholars, and practitioners with important findings to consider.