Whether Miranda interrogation includes only express questioning or also indirect police conduct.
Holding
Miranda interrogation includes both express questioning and its functional equivalent.
Reasoning
Miranda protects against the coercive pressures created by custodial interrogation, not merely against questions phrased directly to a suspect. The Miranda opinion itself recognized that police may use psychological tactics and other methods of persuasion that do not take the form of express questioning.
At the same time, custody alone does not make every statement a product of interrogation. Miranda permits volunteered statements, so interrogation must involve compulsion beyond the ordinary pressures inherent in arrest and custody.
The functional equivalent of questioning consists of words or actions by police, apart from those normally attendant to arrest and custody, that police should know are reasonably likely to elicit an incriminating response. An incriminating response includes any statement, inculpatory or exculpatory, that the prosecution could seek to use at trial.
This test focuses principally on the suspect's perceptions rather than on proving an officer's subjective purpose. Police intent can still matter as evidence of what officers should have known, and known unusual susceptibility of a particular suspect may be important. But officers are not responsible for unforeseeable reactions to their words or conduct.