This chapter starts to challenge the narrative introduced in chapters 1 and
2, and establishes the central relation within Prevent between security and
temporality. It argues that Prevent represents a novel ambition for the
state: early intervention into processes of becoming violent. It thus
intervenes within conditions of uncertainty, in that it is not certain
whether such an individual would go on to participate in violence or any
other illegal act. Engaging with the emergent academic literature in this
area, the chapter argues that such intervention necessarily acts within
conditions of uncertainty. This in turn requires discursive and
institutional mechanisms that make such a threat knowable and actionable.
The term preclusive is introduced here as a general term that emphasises
this relation between security and temporality, making clear that all acts
of securing are necessarily productive of a future threat they then
preclusively act on to mediate. The chapter then demonstrates how the
concept of radicalisation fulfils this function for Prevent, identifying
potential future violence in the present.