PART II
PROCEDURE RELATING TO CRIMINAL INVESTIGATIONS
A. - Arrest, Escape, Recapture, Search Warrants and Seizure
(b) Arrests and Warrant of Arrest
23.-(1) A person who arrests another person shall, at the time of the arrest, inform that other person of the offence for which he is arrested.
(2) A person who arrests another person shall be taken to have complied with subsection (1) if he informs the other person of the substance of the offence for which he is arrested; and it is not necessary for him to do so in a language of a precise or technical nature.
(3) Subsection (1) does not apply to or in relation to the arrest of a person–
(a) if, by reason of the circumstances in which he is arrested, that person ought to know the substance of the offence for which he is arrested; or
(b) if by reason of his actions the person arrested makes it impracticable for the person effecting the arrest to inform him of the offence for which he is arrested.
Rights during investigation - informed of belief that crime has been committed
EDIT.