PART II
PROCEDURE RELATING TO CRIMINAL INVESTIGATIONS
B. - Powers and Duties of Police Officers when Investigating Offences
(c) Duties when Interviewing Suspects
52.-(1) Where a police officer suspects that a person may have committed a serious offence, or believes that information has been received by the police that may implicate a person in the commission of a serious offence, but that suspicion or belief is not such as would, under section 14, justify the arrest of the person without warrant, the police officer shall not ask him any questions, unless he has first informed him that he may refuse to answer any questions put to him by the police officer.
Rights during investigation - remain silent
EDIT.