This article provides an overview of dangerous offender legislation, d
rawing on material from a range of English-based jurisdictions. It ill
ustrates both the continuity of dangerousness as a modern penal proble
m and the discontinuity in relation to behaviour thought to be dangero
us and the tactics and technologies employed in its calibration. Such
discontinuities are seen as the product of the shift in political rati
onality from welfarism to neo-liberalism during the last two decades.