This chapter examines government powers of arrest and detention. Section I provides a three-part analysis of police powers to restrict an individual’s physical liberty under what we might regard as ‘ordinary’ laws. The first part of the chapter considers powers of ‘arrest’; the second section addresses powers of detention that arise consequent upon arrest but before the detained person has been charged with any offence; and the third considers situations in which a person can lawfully be detained without actually being arrested. Section II shifts the focus of the chapter to what we might consider to be ‘extraordinary’ laws, by describing and analysing the extent to which the constitution permits deprivation of liberty for ‘terrorist’ offences, specifically powers of arrest and detention which existed between 1945 to 1977, and then in the post-1977 era.
