CHAPTER 2 - BILL OF RIGHTS
Right to personal liberty
SECTION 9
(3) If a person is detained pursuant to a measure authorised under a state of emergency—
(a) the person must, as soon as is reasonably practicable and in any event within 7 days after the start of the detention, be given a statement in writing, in a language that the person understands, specifying the grounds of the detention;
Language
Rights during investigation - arbitrary arrest or detention and deprivation of liberty
Rights during investigation - informed of belief that crime has been committed
EDIT.