The caution administered to a suspect has two limbs, both of which must be understood: the right not to answer questions, and the fact that any answers may be used in evidence. Where an interpreter fails to properly convey the second limb, and police continue questioning after the suspect has repeatedly stated a wish to remain silent (particularly where a lawyer has communicated that wish in writing), the unfairness discretion requires exclusion of the resulting interview. An extensive criminal history does not, without more, establish understanding of the caution by an Aboriginal suspect with limited English.
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