When there are grounds to suspect that a person has committed an offence, you must caution them before any questions about it are put to them to ensure that the answers (or any failure to answer) are capable of being admissible in evidence in a prosecution.

The caution must be in the following terms:

"You do not have to say anything. But it may harm your defence if you do not mention when questioned something which you later rely on in court. Anything you do say may be given in evidence."

You should ensure that the person understands the caution. You should be prepared to explain what the caution means if the suspect is unclear. At the same time as the caution, you should say that the person is not under arrest or obliged to remain, and may obtain legal advice.