Whether an interrogating officer's subjective and undisclosed belief that a person is, or is not, a suspect is relevant to whether the person is in custody for Miranda purposes.
Holding
No. Undisclosed police suspicions or beliefs do not determine Miranda custody; the inquiry turns on the objective circumstances and how a reasonable person in the interviewee's position would understand his freedom to leave.
Reasoning
Miranda warnings are required only when a person is subjected to custodial interrogation. Custody exists when there has been a formal arrest or a restraint on freedom of movement of the degree associated with a formal arrest. Although courts must consider all circumstances surrounding an interrogation, the ultimate question is objective.
The Court's earlier decisions rejected a rule making custody depend on whether an investigation had focused on the person questioned. In Beckwith, the Court explained that Miranda responds to the coercive pressures of custodial interrogation, not to the strength or content of the Government's suspicions. Thus, a person may be a focus or even a suspect without being in custody.
Berkemer likewise established that an officer's uncommunicated plan to arrest a person has no bearing on custody. Because the person being questioned cannot know an officer's private thoughts, those thoughts cannot alter the objective circumstances that shape a reasonable person's perception of freedom of action.
An officer's beliefs can matter only when they are conveyed or otherwise manifested to the person questioned. Even then, a statement that someone is a prime suspect is not automatically dispositive, because a reasonable person may understand that he remains free to leave despite police suspicion. The significance of such communications depends on the full context of the encounter.