In Thompson, the Supreme Court applied Miranda by clarifying when a suspect must be given Miranda warnings.
In the Miranda decision, the Court set out the rule that suspects must be warned of their rights whenever they are taken into custody or have their freedom of movement significantly restricted. This rule is not completely clear and that was the issue in Thompson. In that case, the Court held that a suspect who was questioned for 2 hours was in custody even though he was repeatedly told that he had the right to leave. The Court ruled that a person is in custody in any situation where a reasonable person would feel they were not at liberty to leave. This rule clarified the rule set out in Miranda.