13. Denials of an offence

This chapter deals with the rules on denials of an offence, a denial of one or more actus reus or mens rea elements. In particular, it considers three sets of rules relating to the denial of an offence: intoxication, sane automatism, and insanity. As well as discussing how each of these rules can be used by D to avoid liability, the chapter also focuses on how circumstances of ‘prior fault’ can be used by the prosecution to substitute for missing mens rea elements so as to construct liability. It also outlines potential options for legal reform concerning intoxication, sane automatism, and insanity, and concludes by considering how denials of offending based on intoxication, automatism, and insanity should be applied to problem facts. Relevant cases are highlighted throughout the chapter, with brief summaries of the main facts and judgments.