The "functional equivalent of a question test" was developed in what SCOTUS decision?

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The "functional equivalent of a question test" was developed in the Supreme Court decision Rhode Island v. Innis, where the Court held that an interrogation refers not only to express questioning, but also to any words or actions on the part of the police that they should know are reasonably likely to elicit an incriminating response from the suspect.

The "Functional Equivalent of a Question Test" Was Developed in What