Section 8(2) of the Act provides that the adult is not required to answer any questions, and that the adult must be informed of that fact before the interview commences. The adult can choose to answer any question put to them, but the purpose of this section is to ensure that they are not forced to answer any question that they choose not to answer.
However, seeking the consent of the adult to be interviewed should not be a matter of simply advising that they are not obliged to answer. Good practice would be to ensure that the adult is clear regarding the purpose of the interview and is given reasonable opportunity and support to answer questions whilst respecting their right not to.
A lack of capacity to consent to being interviewed is not an automatic barrier to them participating in an interview. The principal of participating ‘as fully as possible’ should be adhered to.