Social dangerousness
Social dangerousness is a category of anti-social behaviour on the basis of detectors of dangerousness that enable the judicial authorities to justify the need for a particular control by the police authorities.
These measures differ from country to country: in Italy they are called preventive measures, which are derived from a comprehensive analysis that involves both the tendency to commit crimes and the sphere of the moral conduct of an individual. In United Kingdom, they were foreseen by Anti-social Behaviour Act 2003 as injunctions; in United States many States apply civil confinement to some antisocial behaviour.
On the opposite side, some governments links this analysis directly to prison terms, not complying to nulla poena sine lege principle.