Police have the power to arrest people for the purpose of a Record of Interview.
Following an arrest, you can elect to give a “no comment” interview whereby you refuse to answer the questions of the police member interviewing you. The only answers you must give are your name and address, otherwise, you have the right to silence.
On some occasions, you may be given the option to waive your right to an interview. This can occur if the accused person is in custody and has sought legal advice. This information is then communicated to police via the accused’s legal representative.