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Whether it is a question of the age below which a child cannot be held liable for their actions, or the attribution of responsibility to defendants with mental illnesses, mental incapacity is a central concern for legal actors, policy makers, and legislators when it comes to crime and justice. Understanding the terrain of mental incapacity in criminal law is notoriously difficult; it involves tracing overlapping and interlocking legal doctrines, current and past practices including those of evidence and proof, and also medical and social understanding of mental order and incapacity. Bringing together previously disparate discussions on criminal responsibility from law, psychology, and philosophy, this book provides a close study of mental incapacity defences, analysing their development through historical cases to the modern era. It maps the shifting boundaries between normality and abnormality as constructed in law, arguing that ‘manifest madness’ — the distinct character of mental incapacity revealed by this interdisciplinary approach — has a broad significance for understanding the criminal law as a whole.

normality --- legal doctrines --- mental order --- mental incapacity --- abnormality --- justice --- crime --- criminal law --- mental illness --- criminal responsibility

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Explaining Criminal Careers presents a simple quantitative theory of crime, conviction and reconviction, the assumptions of the theory are derived directly from a detailed analysis of cohort samples drawn from the “UK Home Office” Offenders Index (OI). Mathematical models based on the theory, together with population trends, are used to make: exact quantitative predictions of features of criminal careers; aggregate crime levels; the prison population; and to explain the age-crime curve, alternative explanations are shown not to be supported by the data. Previous research is reviewed, clearly identifying the foundations of the current work. Using graphical techniques to identify mathematical regularities in the data, recidivism (risk) and frequency (rate) of conviction are analysed and modelled. These models are brought together to identify three categories of offender: high-risk / high-rate, high-risk / low-rate and low-risk / low-rate. The theory is shown to rest on just 6 basic assumptions. Within this theoretical framework the seriousness of offending, specialisation or versatility in offence types and the psychological characteristics of offenders are all explored suggesting that the most serious offenders are a random sample from the risk/rate categories but that those with custody later in their careers are predominantly high-risk/high-rate. In general offenders are shown to be versatile rather than specialist and can be categorised using psychological profiles. The policy implications are drawn out highlighting the importance of conviction in desistance from crime and the absence of any additional deterrence effect of imprisonment. The use of the theory in evaluation of interventions is demonstrated.

reconviction --- recidivism --- offenders index --- oi --- criminal careers --- prison population --- conviction --- age-crime curve --- theory of crime